| "A Dhonnacha, is léan duit an scéal seo le n-innsint" : David O'Brien's advice to Denis O'Sullivan | Hamilton, Pádraig | Article in Journal | | 2016 |
| "After the Earl Bishop" : the management of Downhill in the nineteenth century | Proudfoot, Lindsay J. | Article in Book | Geography Publications | 1999 |
| "An art that knows its mind" : Prayer, poetry and post-Catholic identity in Seamus Heaney's "Squarings" | O'Brien, Eugene | Article in Journal | | 2014 |
| "Blaze away and stand to it boys" : Captain Jack Donovan and the Irish Brigade at Fredericksburg | O'Brien, Kevin | Article in Journal | | 1996 |
| "Burke's political testament" : Thomas Hussey and the Irish Directory | Keogh, Dáire | Article in Book | Poolbeg | 1998 |
| "Der Mary this is fine cuntry is there is in the wourld" : Irish-English and Irish in late eighteenth- and nineteenth-century Australia | Troy, Jakelin | Article in Book | Poolbeg | 1991 |
| "From the Isle of Saints to the Holy Land": Irish encounters with Zionism in the Palestine Mandate | Gannon, Sea´n William | Article in Book | | 2018 |
| "Hibernians on the march" : Irish America and ethnic patriotism in the mid-twentieth century | O'Brien, Matthew J., 1968- | Article in Journal | | 2005 |
| "Hibernians on the march" : Irish-American ethnicity and the Cold War | O'Brien, Matthew J., 1968- | Article in Book | Irish Academic Press | 2009 |
| "In the name of God and of the dead generations" : nationalism and republicanism in Ireland | Callanan, Frank | Article in Book | Poolbeg | 1998 |
| "Lymerick Plantation" - Berkeley County, South Carolina | O'Brien, Michael J. | Article in Journal | | 1926 |
| "New Jerusalem": Constructing Jewish space in Ireland, 1880-1914 | Hession, Peter | Article in Book | | 2018 |
| "Not so different after all": Irish and Continental European Antisemitism in comparative perspective | Douglas, R. M. | Article in Book | | 2018 |
| "Our Magee problem" : Stormont and the second university | O'Brien, Gerard | Article in Book | Geography Publications | 1999 |
| "Safely to Bandon" - the fate of the planters of Clonakilty in 1641 | O'Brien, Damien | Article in Journal | | 1995 |
| "Setting people on thinking" : Burke's legacy in the debate on Irish affairs | O'Brien, Conor Cruise, 1917-2008 | Article in Book | Four Courts Press | 1997 |
| "Spirit, impartiality and independence" : The Northern Star, 1792-1797 | O'Brien, Gillian | Article in Journal | | 1998 |
| "The Irish Donation" - 1676 | O'Brien, Michael J. | Article in Journal | | 1913 |
| "The Irish movement in this country is now moribund" : the anti-partition campaign of 1948-1951 in the United States | Davis, Troy D. | Article in Book | Irish Academic Press | 2009 |
| "The right of the people of Ireland to the (...) unfettered control of Irish destinies" : Edna O'Brien, Willful Subjects, and Counter-narratives of the Republic | McCann, Fiona | Article in Journal | | 2016 |
| "The sinner of Hollywood" : James Quinn (Seamus O'Chuinn), alias Tim O'Brien | Harris, Ruth-Ann | Monograph or Collective Volume | Irish Studies Program, Northeastern University | 1991 |
| "They are not worthy of themselves" : the 'Tailor and Ansty' debates of 1942 | Richardson, Caleb | Article in Journal | | 2007 |
| "Too old at thirty-three" : the log of William Henry O'Brien, 1908-10 | Share, Bernard | Article in Journal | | 2005 |
| "We had a song to sing O" | O'Brien, Anthony | Article in Journal | | 2003 |
| ‘To solitude consigned’ : the Tasmanian journal of William Smith O’Brien, 1849-1853 | | Monograph or Collective Volume | Crossing Press | 1995 |
| 'A candidate who seemed tailor-made for the job' | Mitchell, Thomas | Article in Book | New Island | 2015 |
| 'A deplorable narrative' : Gladstone, R. Barry O'Brien and the 'historical argument' for Home Rule, 1880-90 | Sheehy, Ian | Article in Book | Palgrave Macmillan | 2010 |
| 'A diabolical murder' : Clan na Gael, Chicago and the murder of Dr Cronin | O'Brien, Gillian | Article in Journal | | 2015 |
| 'A disgrace to a civilised country' ; making sense of Westmeath at Westminster, 1871 | Kenny, Michael | Article in Book | Geography Publications | 2022 |
| 'A few human hearts in Catholic breasts': Angina pectoris, emotions and Kate O'Brien's "Mary Lavelle" | O'Neill, Margaret | Article in Journal | | 2018 |
| 'A Mixing of Social and National Aspirations'.
The Irish Self-Determination League of Great Britain (ISDL), 1919-31 | Manning, Pádraig | Article in Journal | | 2019 |
| 'A particular view of what was possible': Labour in government | McCullagh, David | Article in Book | | 2012 |
| 'A precious boon' in difficult times: Hanna Sheehy Skeffington and her sisters, Margaret, Mary and Kathleen | Ward, Margaret | Article in Book | NA | 2022 |
| 'A tainted source'? : The Irish Bulletin, 1919-21 | Kenneally, Ian | Article in Book | Four Courts Press | 2014 |
| 'Advice to a daughter': Lady Frances Keightley to her daughter Catherine, September 1681 | Keightley, Frances, Lady, 1675-1725 | Article in Journal | | 2012 |
| 'An extraordinary clever journalist' : Arthur Griffith's editorships, 1899-1919 | Kenny, Colm | Article in Book | Four Courts Press | 2014 |
| 'An honourable station in respect of commerce, as well as constitutional liberty' : retailing, consumption and economic nationalism in Dublin, 1720-85 | Foster, Sarah | Article in Book | Four Courts Press | 2008 |
| 'An invaluable legacy to future generations of educationalists' | Hyland, Áine | Article in Book | New Island | 2015 |
| 'And all her ghosts that walk': commemorating the past in Dublin's future | O'Brien, Gillian | Article in Book | Four Courts Press | 2012 |
| 'Beauties and defects' : Maria Edgeworth's representations of Georgian Dublin | Murphy, Sharon | Article in Book | Four Courts Press | 2008 |
| 'Burnt magic' | O'Brien, Elizabeth | Article in Book | | 2010 |
| 'By no means relished by the gentlemen of the bar' : King's Inns moves to Constitution Hill | Kenny, Colum | Article in Book | Four Courts Press | 2008 |
| 'By today's standards it was a cramped office' | Quinn, Ruairí | Article in Book | New Island | 2015 |
| 'Challenging the headship of man' : militant suffragism and the Irish Citizen | Tiernan, Sonja | Article in Book | Four Courts Press | 2014 |
| 'Dear dirty Dublin' : a city in distress, 1899-1916 | O'Brien, J. V. | Monograph or Collective Volume | University of California Press | 1982 |
| 'Denounced from Catholic pulpits all around the country' | Robinson, Mary | Article in Book | New Island | 2015 |
| 'Distressed country' - Wicklow in 1599 | O'Brien, Andrew | Article in Journal | | 1999 |
| 'Facile ignorance' and 'wild wild women' : religion, journalism and social change in Ireland, 1961-1979 | O'Brien, Mark | Article in Book | New Island | 2015 |
| 'Farewell Spain': Kate O'Brien's elegy to war-torn Spain | Mittermaier, Ute Anna | Article in Journal | | 2013 |
| 'Figures suddenly leap from frames' : Myles na gCopaleen, modernism and Irish art | Gibbons, Luke | Article in Book | | 2023 |
| 'Give' and 'take': Luke Gardiner and the making of the north city | Kelly, Merlo | Article in Book | | 2012 |
| 'God forbid it should come to that' : the feud between Colonel Molesworth and Major-General O'Brien in Portugal, 1663 | Appleby, David J. | Article in Journal | | 2005 |
| 'Goeth over onely to obtaine breeding': William O'Neylon's certificate of passage to Spain | McInerney, Luke | Article in Journal | | 2018 |
| 'He considers anger a waste of energy' | Trench, Brian | Article in Book | | 2015 |
| 'Humour is the safety valve of a nation' : Dublin Opinion 1922-68 | Larkin, Felix M. | Article in Book | | 2014 |
| 'I am building a house': Nano Nagle's Georgian convents | Castle, JessieO'Brien, Gillian | Article in Journal | | 2016 |
| 'I am sure there was confidence in Nero' | O'Halpin, Eunan | Article in Book | | 2015 |
| 'I was altogether out of tune with my colleagues': Conor Cruise O'Brien and Northern Ireland, 1969-77 | Kelly, Stephen | Article in Journal | | 2021 |
| 'If it's socialism you want, join some other party': Labour and the left | Purséil, Niamh | Article in Book | | 2012 |
| 'Initiative and courage' : Frank Aiken and the Congo crisis, 1960-1961 | Kennedy, Michael (Michael J.) | Article in Book | | 2014 |
| 'Irish Ireland' and the 'Irish Independent', 1905-22 | Whelan, Aoife | Article in Book | | 2012 |
| 'Make way for the Molly Maguire's!' The Ancient Order of Hibernians and the Irish Parliamentary Party, 1902-4 | McCluskey, Fergal | Article in Journal | | 2012 |
| 'May we safely refer to the Land League?': Independent Newspapers and Emergency censorship, 1939-45 | Ó Drisceoil, Donal | Article in Book | | 2012 |
| 'More than a language ... no more of a language' : Merriman, Heaney, and the metamorphoses of translation | O'Brien, Eugene | Article in Journal | | 2004 |
| 'Never justify. Never explain' : some thoughts in Irish political memoirs | Rafter, Kevin | Article in Book | | 2015 |
| 'No good Catholic can be a true socialist' : the Labour party and the Catholic Church, 1922-52 | Ferriter, Diarmaid | Article in Book | | 2012 |
| 'Spirit, impartiality and independence': the Northern Star, 1792-1797 | O'Brien, Gillian Pauline Mary | Thesis | | 1998 |
| 'That dear long ago' : the story of Canon Sheehan and William O'Brien | O'Rahilly, Sean | Article in Journal | | 1983 |
| 'The appearance of a continued city' : Dublin's Georgian suburbia | O'Kane, Finola | Article in Book | | 2008 |
| 'The best interests of the nation' : Frank Geary, the 'Irish Independent' and the Spanish Civil War | O'Brien, Mark | Article in Book | | 2012 |
| 'The Devil Era': the presence of Éamon de Valera in three novels by Kate O'Brien | Roche, ANTHONY | Article in Journal | | 2018 |
| 'The Irish people should feel ashamed of themselves for what they had done' : party politics and the Fianna Fáil manifesto of 1977 | Murphy, Gary | Article in Book | | 2015 |
| 'The last of the hereditary bards of Thomond' Séamus Mac Cruitín, 1815-70 | Ó Dálaigh, Brian | Article in Journal | | 2007 |
| 'The most expensive literary publication ever printed in Ireland' : James Moore and the publication of Encyclopaedia Britannica in Ireland, 1790-1800 | Archbold, Johanna | Article in Book | | 2008 |
| 'The passion of particularity' : Magill, 1977-90 | Rafter, Kevin | Article in Book | | 2014 |
| 'The poor man was justifiably brassed off' | Tobin, Fergal | Article in Book | | 2015 |
| 'The sense of history' : working at Independent House | Milne, Ida | Article in Book | | 2012 |
| 'The vast difficulty of cataloguing' : the printed catalogue of Trinity College, Dublin (1864-1887) | Kinane, VincentO'Brien, Ann | Article in Journal | | 1988 |
| 'Them wild woods' : the Greeves, O'Brien and Sinton letters. The Transatlantic letters of an Irish Quaker family, 1818-1877 | | Monograph or Collective Volume | Ulster Historical Foundation | 2011 |
| 'Tumbling into the flight' : Charlotte Grace O'Brien (1845-1909), the emigrant's advocate | Miller, Chandra | Article in Journal | | 1996 |
| 'We are proud of you' : screening Kennedy in Ireland | O'Brien, Harvey | Article in Book | | 2009 |
| 'What can possess you to go to Ireland?' : visitors' perceptions of Dublin, 1800-30 | O'Brien, Gillian | Article in Book | | 2008 |
| 'Where and what is Ireland?' Fr Senan and the Capuchin Annual, 1930-54 | Perkins, Sonya | Article in Book | | 2014 |
| 'With the Irish in France' : the national press and recruitment in Ireland, 1914-1916 | O'Brien, Mark 1973- | Article in Journal | | 2016 |
| 'You don't win votes at election time, you harvest them' | Fitzgerald, Eithne | Article in Book | | 2015 |
| 'You'll be lucky to have him' | Dooley, Séamus | Article in Book | | 2015 |
| 'Your Dinner's Poured Out!' : Boyhood in the Twenties in a Dublin that has disappeared | Crosbie, Paddy | Monograph or Collective Volume | O'Brien Press | 1981 |
| 100 years of Liberty Hall : papers on the history of SIPTU, given at the Irish Labour History Society Conference, 22 October 2009 | | Monograph or Collective Volume | [SIPTU] | 2013 |
| 1000 years of Irish whiskey | Magee, Malachy | Monograph or Collective Volume | O'Brien Press | 1980 |
| 125 years of the G.A.A. and its Kilmallock connection | McGrath, Joe | Article in Journal | | 2009 |
| 16 lives : Con Colbert | O’Callaghan, John | Monograph or Collective Volume | O'Brien Press | 2015 |
| 16 lives : Éamonn Ceannt | Gallagher, Mary | Monograph or Collective Volume | O'Brien Press | 2014 |
| 16 lives : Edward Daly | Litton, Helen | Monograph or Collective Volume | The O'Brien Press | 2013 |
| 16 lives : James Connolly | Collins, Lorcan | Monograph or Collective Volume | O'Brien Press | 2012 |
| 16 lives : John MacBride | Fallon, Donal | Monograph or Collective Volume | O'Brien Press | 2015 |
| 16 lives : Michael O’Hanrahan | Kostick, Conor | Monograph or Collective Volume | O'Brien Press | 2015 |
| 16 lives : Patrick Pearse | O’Donnell, Ruán | Monograph or Collective Volume | O'Brien Press | 2016 |
| 16 lives : Roger Casement | Mitchell, Angus | Monograph or Collective Volume | O'Brien Press | 2013 |
| 16 lives : Seán Heuston | Gibney, John | Monograph or Collective Volume | O'Brien Press | 2013 |
| 16 lives : Seán Mac Diarmada | Feeney, Brian | Monograph or Collective Volume | O'Brien Press | 2014 |
| 16 lives : Thomas Clarke | Litton, Helen | Monograph or Collective Volume | O'Brien Press | 2014 |
| 16 lives : Thomas Kent | Ryan, Meda | Monograph or Collective Volume | O'Brien Press | 2016 |
| 16 lives : Thomas MacDonagh | Kenna, Shane | Monograph or Collective Volume | O'Brien Press | 2014 |
| 16 Lives : Willie Pearse | Ní Ghairbhí, Róisín | Monograph or Collective Volume | O'Brien | 2015 |
| 1641 | Houston, A. | Article in Book | | 1906 |
| 1891-1916 | Bew, Paul | Article in Book | | 2016 |
| 1891-1916 | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1960 |
| 500 years of Irish silver : an exhibition at the National Museum of Ireland | Delamer, Ida,O'Brien, Conor, 1933- | Monograph or Collective Volume | Wordwell in association with the National Museum of Ireland | 2005 |
| A 'Dreary Fantasy'? George O'Brien, political determinism, and the economic consequences of partition | Brownlow, Graham | Article in Book | | 2021 |
| A 13th-century hall house at Clohaskin, Co. Tipperary | O'Brien, Caimin | Article in Journal | | 1994 |
| A 14th-century Meath estate acquired too soon: Golding of Churchtown | O'Brien, Niall C.E.J. | Article in Journal | | 2019 |
| A 1589 deed between McGilleragh and the earl of Thomond for Cragbrien | McInerney, Luke | Article in Journal | | 2016 |
| A 1640 register of the Thomond Papers at Petworth House [with index] | McGrath, Bríd ; McInerney, Luke | Article in Journal | | 2021 |
| A baluster-headed ringed pin from Richmond, Nenagh | O'Brien, Richard | Article in Journal | | 2009 |
| A bibliography of the writings of N. W. English | O'Brien, Gearoid | Article in Book | | 1980 |
| A Bishop of penal times: the life and times of John O'Brien, Bishop of Cloyne and Ross, 1701-1769 | Coombes, James | Monograph or Collective Volume | Tower Books | 1981 |
| A call to arms | O'Brien, Paul | Article in Journal | | 2014 |
| A Carrigaholt romance | De Bhaldraithe, Pádraig | Article in Journal | | 2004 |
| A celebration of Limerick's silver | | Monograph or Collective Volume | Collins Press in association with the Hunt Museum | 2007 |
| A Clareman in Van Diemen's land : the Tasmanian journal of William Smith O'Brien | Nolan, William | Article in Journal | | 1992 |
| A comparative study of the wills of the first and fourth earls of Thomond | Ó Dálaigh, Brian | Article in Journal | | 1992 |
| A comparison of aspects of the 1913-21 and 1998-2007 Irish 'peace processes' | O'Brien, Ronan | Article in Journal | | 2008 |
| A comparison of the experiences of Dublin city and Limerick city during the cholera epidemic of 1832 | Mangan, Michelle | Article in Book | | 2008 |
| A concise history of Ireland | O'Brien, C. C.O'Brien, Máire | Monograph or Collective Volume | Thames & Hudson | 1972 |
| A conflict of interest | O'Brien, Paul | Article in Journal | | 2012 |
| A country in transition : cartographic evidence for landscape and social change in early modern Westmeath | Horner, Arnold | Article in Book | Geography Publications | 2022 |
| A coward if I return, a hero if I fall : stories of Irish soldiers in WWI | Richardson, Neil | Monograph or Collective Volume | O'Brien Press | 2010 |
| A crisis of ethics : breaking the cycle of newspaper irresponsibility | Frost, Chris | Article in Book | | 2015 |
| A curious journey on the high seas | Murray, GarethO'Brien, Paul | Article in Journal | | 2013 |
| A day in Georgian Dublin | O'Brien, Eoin | Article in Book | | 1978 |
| A deceived audience or a discerning audience? : news management and the threat to the public sphere | Corcoran, Mary P. | Article in Book | | 2005 |
| A divided house: the Irish Trades Union Congress and the origins of the Irish Labour Party | O'Brien, Rónán | Article in Book | | 2012 |
| A forgotten revolution : the 1883 Labourers' Act in County Tipperary | Marnane, Denis G. | Article in Journal | | 2007 |
| A forgotten revolution: the 1883 Labourers' Act in County Tipperary | Marnane, Denis G. | Article in Journal | | 2008 |
| A Franco-Irish solution? : Francois Mauriac, Kate O'Brien and the Catholic intellectual novel | Ryan, Angela | Article in Book | | 2004 |
| A garden is a lovesome thing | O'Brien, Grania R. | Article in Journal | | 1996 |
| A geophysical survey of Carrowmore ecclesiastical complex, Inishowen | Adams, MaxO'Brien, Colm | Article in Journal | | 2013 |
| A glance at some pioneer Irish in the south | O'Brien, Michael J. | Article in Journal | | 1907 |
| A great Irish soldier - 'Murrough of the burnings', born 1614 - died 1674 | O'Brien, M. | Article in Journal | | 1965 |
| A hidden phase of American history : Ireland's part in America's struggle for liberty | O'Brien, M. J. | Monograph or Collective Volume | Genealogical Publishing | 1973 |
| A history of Irish ballet from 1927 to 1963 | O'Brien, Victoria | Monograph or Collective Volume | Peter Lang | 2011 |
| A history of the Burke/Bourke clan | O'Brien, Maureen | Monograph or Collective Volume | Clan Publications | 1990 |
| A history of the parish of Rowlestown | | Monograph or Collective Volume | IPJ Print Services | 2014 |
| A history of the Pearse Battalion 1946-1959 | O'Brien, Louis | Monograph or Collective Volume | Pearse Battalion Association | 2005 |
| A Kildare freedom box | O'Brien, Conor, 1933- | Article in Journal | | 1987 |
| A matter of minutes : the enduring legacy of Bloody Sunday | O'Brien, Joanne | Monograph or Collective Volume | Wolfhound | 2002 |
| A medical appointment in Meath : controversy in Kilskyre | Ó hÓgartaigh, Margaret | Article in Journal | | 2006 |
| A memoir of the Right Rev. James Thomas O'Brien, late Lord Bishop of Ossory ... | Carroll, W. G. | Monograph or Collective Volume | | 1875 |
| A military assessment of Sarsfield | O'Brien, B. | Article in Journal | | 1970 |
| A mobile fortune : the life and times of Denis O'Brien | Creaton, Siobhán | Monograph or Collective Volume | Aurum Press | 2010 |
| A nation once again : towards an epistemology of the republican 'imaginaire' | O'Brien, Eugene | Article in Book | | 2003 |
| A nursery of editors : the Cork Free Press, 1910-1916 | Maume, Patrick | Article in Journal | | 2007 |
| A peer's daughter marries a Catholic doctor : the Hon. Beryl O'Brien and Pat Gallagher, 9 April 1929 | O'Riordan, Maeve | Article in Book | | 2019 |
| A personal memoir of the thirties | Ó hEidirsceoil, Seán | Article in Book | | 1994 |
| A pocket history of Gaelic culture | Titley, Alan | Monograph or Collective Volume | O'Brien Press | 2000 |
| A pocket history of Ireland | Ó hEithir, Breandán | Monograph or Collective Volume | O'Brien Press | 1989 |
| A pocket history of Irish literature | Jeffares, A. Norman | Monograph or Collective Volume | O'Brien Press | 1997 |
| A pocket history of Irish traditional music | Ó hAllmhuráin, Gearóid | Monograph or Collective Volume | O'Brien Press | 1998 |
| A pocket history of the IRA | O'Brien, Brendan | Monograph or Collective Volume | O'Brien Press | 1997 |
| A pocket history of Ulster | Barton, Brian, 1944- | Monograph or Collective Volume | O'Brien Press | 1996 |
| A poem addressed to Donnchadh Ó Briain fourth earl of Thomond | Ní Úrdail, Meidhbhín | Article in Book | | 2004 |
| A poem in praise of Aodh Úa Foiréidh, bishop of Armagh (1032-1056) | Murphy, Gerard | Article in Book | | 1944 |
| A poem on the adventures abroad and death of Donnchadh son of Brian Bóraimhe | Ní Urdail, Meidhbhín | Article in Journal | | 2012 |
| A portrait of Irish medicine : an illustrated history of medicine in Ireland | Crookshank, AnneO'Brien, EoinWolstenholme, Gordon | Monograph or Collective Volume | Ward River Press | 1984 |
| A prehistory of Kerry | O'Brien, William | Article in Book | | 2020 |
| A preliminary note on the archaeological site of Woodtown 6, Co. Waterford | O'Brien, Richard | Article in Journal | | 2005 |
| A primitive mining complex at Derrycarhoon, county Cork | O'Brien, William | Article in Journal | | 1989 |
| A question of attitude : responses to the new Poor Law in Ireland and Scotland | O'Brien, Gerard | Article in Book | | 1988 |
| A question of duty : the Curragh incident 1914 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2014 |
| A re-assessment of the "great sepulchral mound" containing a Viking burial at Donnybrook, Dublin | O'Brien, Elizabeth | Article in Journal | | 1992 |
| A re-evaluation of the find-spot of, and a possible context for, the anthropoid hilted sword | O'Brien, Elizabeth | Article in Book | | 2009 |
| A reconsideration of the location and context of Viking burials at Kilmainham/Islandbridge, Dublin | O'Brien, Elizabeth | Article in Book | | 1998 |
| A select bibliography of the library | O'Brien, Ann | Article in Book | | 1986 |
| A select bibliography of the library | Nicholson, CiaranO'Brien, Ann | Article in Book | | 2000 |
| A short account of some of the seafarers from Wicklow Town who were lost at sea through inclement weather and war | Byrne, Tom | Article in Journal | | 2020 |
| A short bibliography of Westmeath local history | O'Brien, Gearoid | Article in Journal | | 1987 |
| A short history of Ireland's rebels | Llywelyn, Morgan | Monograph or Collective Volume | O'Brien Press | 2013 |
| A short history of Irish traditional music | Ó hAllmhuráin, Gearóid | Monograph or Collective Volume | O'Brien Press | 2017 |
| A story on the O'Hallorans from the Inchiquin Papers | O'Halloran, Robert
| Article in Journal | | 2024 |
| A streetscape named desire: long views through the emerging bourgeois city | Cohen, Jeffrey A. | Article in Book | | 2012 |
| A survey of research and writing about Roman Catholic women's congregations in Great Britain and Ireland | O'Brien, Susan | Article in Book | | 2004 |
| A tale of 'womanly intuition' : Hector Legge at the 'Sunday Independent', 1940-70 | Rafter, Kevin | Article in Book | | 2012 |
| A tale of two cemeteries | O'Brien, Elizabeth | Article in Journal | | 1995 |
| A tale of two gardens. For many decades there was an important relationship between the Acton family of Kilmacurragh, Co. Wicklow and David and Frederick Moore at Glasnevin's Botanic Gardens ... how both gardens benefited | O'Brien, Seamus | Article in Journal | | 2010 |
| A third Romanesque font from county Wexford. [The author] speculates about another unusual ecclesiastical artifact | O'Brien, Keith | Article in Journal | | 2015 |
| A threat of satire by Tadhg (mac Dáire) Mac Bruaideadha | McLaughlin, Roisín | Article in Journal | | 2005 |
| A trinity of martyrs | Ó Cáinte, Dónal | Article in Journal | | 1990 |
| A various and contentious country: Ireland in 1912 | Murphy, William | Article in Book | | 2012 |
| A view from above : 200 years of aviation in Ireland | MacCarron, Donal | Monograph or Collective Volume | O'Brien | 2000 |
| A view of religious affiliation and practice in Thomond, 1591 | Cunningham, Bernadette | Article in Journal | | 1994 |
| A world of stone : life folklore and legends of the Aran Islands | Curriculum Development Unit | Monograph or Collective Volume | O'Brien Press | 1977 |
| A world of stone. With revisions by Nora Godwin | O'Sullivan, Paul | Monograph or Collective Volume | O'Brien Press | 1977 |
| A Yankee poet's Irish headwaters | Murray, Aífe | Article in Journal | | 2002 |
| Abbeylara : the tragic shooting of John Carthy | Hennelly, Regina | Monograph or Collective Volume | O'Brien Press | 2007 |
| About learning Greek | Grene, David | Article in Book | | 1998 |
| Abraham Lincoln : spirit of Irish freedom | O'Brien, Steve | Article in Journal | | 2005 |
| Additional Sidney state papers, 1566-70 | | Article in Journal | | 1970 |
| Admiral Robert O'Brien (1776-1838) | O'Brien, Ivor | Article in Journal | | 1992 |
| Advertisements for Ireland : being a description of the state of Ireland in the reign of James I contained in a manuscript in the library of Trinity College, Dublin | | Monograph or Collective Volume | | 1923 |
| AE and Sir Horace Plunkett | Byrne, J. J. | Article in Book | | 1960 |
| Afraid of the dark : the tragic story of Robert Holohan | Riegel, Ralph | Monograph or Collective Volume | O'Brien Press | 2006 |
| After Limerick | Murray, A. E. | Article in Book | | 1903 |
| After the Celtic tiger : challenges ahead | Clinch, PeterConvery, FrankWalsh, Brendan M. | Monograph or Collective Volume | O'Brien Press | 2002 |
| After the flood : Irish America 1945-1960 | | Monograph or Collective Volume | Irish Academic Press | 2009 |
| Against the odds | O'Brien, Declan | Article in Journal | | 1995 |
| Agricultural prices and living costs in pre-famine Cork | O'Brien, John B. | Article in Journal | | 1977 |
| Ahead of their time : Irish-American women writers, 1945-1960 | Ebest, Sally Barr | Article in Book | | 2009 |
| All changed : fifty years of photographing Ireland | Doyle, ColmanQuinn, John | Monograph or Collective Volume | O'Brien Press | 2004 |
| All graduates and gentlemen : Marsh's Library | McCarthy, Muriel | Monograph or Collective Volume | O'Brien Press | 1980 |
| All hell will break loose | Currie, Austin | Monograph or Collective Volume | O'Brien Press | 2004 |
| All the news of interest': the Kerryman, 1904–88 | O'Brien, Mark | Article in Book | | 2018 |
| All-Ireland drama festival Athlone, 1953-2002 : 50 glorious years of drama | | Monograph or Collective Volume | All-Ireland Festival Committee | 2002 |
| Aloysius O'Brien (1915-) | Heaney, Olivia | Article in Journal | | 2008 |
| Altar tomb and the prehistory of Mizen | O'Brien, William | Article in Journal | | 1993 |
| Amateur drama in Athlone : some early records | O'Brien, Brendan | Article in Book | | 1980 |
| An account of a debate in the Irish parliament, 1787 | | Article in Journal | | 1986 |
| An account of murder, mutiny and mayhem concerning the affairs of the blackest-hearted villains from Irish history | O'Shea, Joe | Monograph or Collective Volume | O'Brien Press | 2012 |
| An argument manqué : Kate O'Brien's Pray for the Wanderer | Kent, Brad | Article in Journal | | 2010 |
| An argument manqué : Kate O'Brien's Pray for the Wanderer | Kent, Brad | Article in Journal | | 2010 |
| An authoritative account of the earliest Irish pioneers in New England | O'Brien, M. J. | Article in Journal | | 1919 |
| An authoritive account of the earliest Irish pioneers in New England | O'Brien, Michael J. | Article in Journal | | 1919 |
| An Béal Bocht (The Poor Mouth) de Myles na gCopaleen : l'art corrosif et jubilatoire de la 'seconde main' | Jacquin, Danielle | Article in Book | | 2004 |
| An Béal Bocht agus At Swim-Two-Birds: diptic théamach | Mac Cathmhaoil, Nioclás | Article in Book | | 2019 |
| An Béal Bocht: an lámhscríbhinn agus an leabhar | Ó Conaire, Breandán | Article in Book | | 2013 |
| An Chaidheamh Soluis agus Fáinne an Lae : 'the turning of the tide' | Uí Chollatáin, Regina | Article in Book | | 2014 |
| An elegy on Donnchadh Ó Briain, fourth earl of Thomond | | Article in Journal | | 1984 |
| An examination of the medieval Irish text 'Caithréim Thoirdhealbhaigh' : the historical value of the 'Caithréim Thoirdhealbhaigh' | McNamara, L. F. | Article in Journal | | 1958 |
| An historical and social diary of Durrow, County Laois, 1708-1992 | O'Brien, E. | Monograph or Collective Volume | Millfield Press | 1992 |
| An identification of the names of the Christian king-list of O’Brien’s Corpus Genealogiarum Hiberniae, volume I; and an assessment of the list’s value for Irish history | Mac Mhuiris, Seán | Article in Journal | | 1995 |
| An interesting example of the extent of Irish emigrations to the American colonies | O'Brien, M. J. | Article in Journal | | 1928 |
| An inventory of the contents of Bunratty Castle and the will of Henry, fifth Earl of Thomond, 1639 | Ó Dálaigh, Brian | Article in Journal | | 1995 |
| An inventory of the property of the late 5th Earl of Thomond | O'Brien, Ivor | Article in Journal | | 1995 |
| An Irish commune : the experiment at Ralahine, county Clare, 1831-1833 | Connolly, James, 1868-1916Craig, E. T.O'Brien, T.Ó Gráda, Cormac | Monograph or Collective Volume | Irish Academic Press | 1983 |
| An Irish radical in a Tory town : William O'Brien in Toronto, 1887 | Storz, Gerald J. | Article in Journal | | 1984 |
| An Irish radical in a Tory town : William Smith O'Brien in Toronto, 1887 | Stortz, Gerald J. | Article in Journal | | 1984 |
| An Irish rebel in Greece: William Smith O'Brien's 1856 visit | Davis, Richard | Article in Journal | | 2009 |
| An Irish scholar abroad : bishop John O'Brien of Cloyne and the Macpherson controversy | Ó Catháin, Diarmaid | Article in Book | | 1993 |
| An Irish voice | O'Dowd, Niall | Monograph or Collective Volume | O'Brien Press | 2010 |
| An O'Brien family in France | O'Brien, P. I. D. | Article in Journal | | 1991 |
| An olive branch in Ireland and its history | O'Brien, William | Monograph or Collective Volume | | 1910 |
| An outline of the history of the civil parishes of Bunratty and Drumline c.1200-1700 | O'Brien, John | Article in Journal | | 1999 |
| An Piarsach óg agus Connradh na Gaeilge | O'Brien, Frank | Monograph or Collective Volume | Clódhanna Teoranta | 1974 |
| An té a bhíonn ag gáire, bíonn a leath faoi fhéin: An tAthair Peadar, am tAthair Gearóid agus Brian Ó Nualláin | de Paor, Louis | Article in Book | | 2019 |
| An tsídheoig is an scian dochtúra : Flann O'Brien agus seanlitríocht na Gaeilge | De Paor, Louis | Article in Book | | 2004 |
| Ancestral voices : religion and nationalism in Ireland | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | Poolbeg | 1994 |
| Ancient Ireland : from prehistory to the middle ages | Harbison, PeterO'Brien, Jacqueline | Monograph or Collective Volume | Weidenfeld and Nicolson | 1996 |
| Ancient Irish deeds and writings, chiefly relating to landed property from the twelfth to the seventeenth century | Hardiman, James | Article in Journal | | 1826 |
| Anecdotum Patricianum : fragments of a Life of Patrick from MSS Cotton Vitellius E vii and Rawlinson B 479 | Bieler, Ludwig | Article in Book | | 1944 |
| Anglo-Irish politics in the age of Grattan and Pitt | O'Brien, Gerard | Monograph or Collective Volume | Irish Academic Press | 1987 |
| Anna Liffey : the river of Dublin | De Courcy, John | Monograph or Collective Volume | O'Brien Press | 1988 |
| Annals from the Book of Leinster, A.D. 457-1189, with a translation of the Irish | | Article in Book | | 1887 |
| Annie O'Brien and Lily Curran, Cumann na mBan, Dublin, 1915-1924 | Curran, LilyO'Brien, Annie | Article in Book | | 2016 |
| Antecedents | Catto, Mike,Gavin, Robert J. | Article in Book | | 2009 |
| Anti-Catholicism | Wolffe, John | Article in Book | Oxford University Press | 2023 |
| Archaeological investigations at Ballylin Hillfort, Co. Limerick | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2016 |
| Archaeological investigations at Toor More (Corrandhu) Hillfort, Co. Kilkenny | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2015 |
| Archaeological investigations in Galway city, 1987-1998 | | Monograph or Collective Volume | Wordwell | 2004 |
| Archbishop Walsh | Leslie, John Randolph (Shane), 1885–1971 | Article in Book | | 1960 |
| Architecture : before 1850 | Craig, Maurice James | Article in Book | | 1969 |
| Architecture and Buildings: Building the Post-Emancipation Church | Jordan, Kate | Article in Book | Oxford University Press | 2023 |
| Architecture and decoration | Casey, Noreen | Article in Book | | 1986 |
| Arrested development: Conor Cruise O'Brien, 1917-2008 | Meehan, Niall | Article in Journal | | 2009 |
| Art O'Brien and Irish Nationalism in London, 1900-25 | MacDiarmada, Mary | Monograph or Collective Volume | Four Courts | 2020 |
| Arthur Griffith | White, Terence De Vere | Article in Book | | 1960 |
| As I was going down Sackville Street | Gogarty, Oliver St John | Monograph or Collective Volume | O'Brien Press | 1994 |
| Aspects of 'Fulacht Fiadh' function and chronology in Cork | O'Brien, William | Article in Journal | | 2012 |
| Aspects of poor law administration and the workhouse in Derry 1838-1948 | Durnin, Patrick | Article in Book | | 1999 |
| Assisted emigration from Clonmellon parish to South Australia in 1847 | Sheridan, Eugene | Article in Book | Geography Publications | 2022 |
| Assisted emigration from Cork to Australia, 1830-1840 | O'Brien, Margaret Judith Rosemary | Thesis | | 1987 |
| Athlone : a garrison town | O'Farrell, Padraic | Article in Book | | 1991 |
| Athlone : an historical study | O'Brien, Brendan | Article in Journal | | 1952 |
| Athlone : the international use of the name | O'Brien, Gearoid | Article in Journal | | 2003 |
| Athlone bridging the centuries | | Monograph or Collective Volume | Westmeath County Council | 1991 |
| Athlone Canal - the first Athlone By-Pass | O'Brien, Gearoid | Article in Journal | | 1998 |
| Athlone castle and museum : modern developments | O'Brien, Gearoid | Article in Book | | 1991 |
| Athlone in old photographs | O'Brien, Gearoid | Monograph or Collective Volume | Gill & Macmillan | 2002 |
| Athlone miscellany | O'Brien, Gearoid | Monograph or Collective Volume | History Press Ireland | 2011 |
| Athlone workhouse and the famine | O'Brien, BrendanO'Brien, Gearoid | Monograph or Collective Volume | The Old Athlone Society | 1995 |
| Athlone's repeal demonstration | O'Brien, Brendan | Article in Journal | | 1971 |
| Athlone, Co. Westmeath : genealogical records | O'Brien, Gearoid | Article in Journal | | 1986 |
| Australia and the Repeal of the [Irish] External Relations Act, 1948 | O'Brien, John B. | Article in Book | | 1986 |
| Australia, Britain, Ireland and the Ottawa Conference : the Empire at Work | O'Brien, John B. | Article in Book | | 1989 |
| Babyface goes to Hollywood : fighters, mobsters and film stars ; the Jimmy McLarnin story | Gallimore, Andrew | Monograph or Collective Volume | O'Brien Press | 2009 |
| Ballyalla and the Clare embroidery class | Rowe, Veronica | Article in Journal | | 2005 |
| Bank building in nineteenth-century Ireland | O'Brien, Emmet | Article in Journal | | 1995 |
| Barrack and community in a time of revolution : the East Yorkshire Regiment in Westmeath, 1919-21 | Hughes, Paul | Article in Book | Geography Publications | 2022 |
| Battleground : the battle for the General Post Office | O'Brien, Paul | Monograph or Collective Volume | New Island | 2015 |
| Beara : journey through history | Durrell, PennyO'Brien, Daniel Maddison | Monograph or Collective Volume | Beara Historical Society | 1991 |
| Beseigers without guns : Athlone 1641-43 | Lenihan, Pádraig, 1959- | Article in Book | Geography Publications | 2022 |
| Best-Loved Swift | Swift, Jonathan | Monograph or Collective Volume | The O'Brien Press | 2018 |
| Between happiness and distress : Erskine Nicol's paintings of rural life in Westmeath in the 1860s | Dochy-Jacquard, Amelie | Article in Book | Geography Publications | 2022 |
| Between the mountains and the sea : Dun Laoghaire - Rathdown county | Pearson, Peter | Monograph or Collective Volume | O'Brien Press | 2007 |
| Between the mountains and the sea : Dun Laoghaire Rathdown County | Pearson, Peter | Monograph or Collective Volume | O'Brien Press | 1998 |
| Beyond St Malachi's, there is nothing : Edward McSorley and the persistence of tradition | Shannon, Christopher | Article in Book | | 2009 |
| Beyond the seas : the transportation of William Smith O'Brien | Kavanagh, Joan | Article in Book | | 1998 |
| Big Biddy Higgins | O'Brien, Pat | Article in Journal | | 2002 |
| Biography | | Article in Book | | 2015 |
| Birth and growth of Skibbereen : an overview | O'Brien, Gerald | Article in Journal | | 2011 |
| Births, marriages and burials and other records of the Irish in America in and about the eighteenth century | O'Brien, Michael J. | Article in Journal | | 1913 |
| Bishop O'Brien's Vatican manuscript | Ó Dochartaigh, Caitríona | Article in Journal | | 2008 |
| Black and white collar films : exploring the Irish film archive collections of clerical films | O'Flynn, Sunniva | Article in Book | | 2004 |
| Blackrock memories | O'Brien, Niall Óg | Article in Journal | | 2000 |
| Blackwater and Bride : navigation and trade, 7,000 BC to 2007 | O'Brien, Niall, 1971- | Monograph or Collective Volume | Niall O'Brien Publishing | 2008 |
| Blood on the streets : 1916 & the battle for Mount Street Bridge | O'Brien, Paul | Monograph or Collective Volume | Mercier Press | 2008 |
| Blood runs green : the murder that transfixed gilded age Chicago | O'Brien, Gillian | Monograph or Collective Volume | The University of Chicago Press | 2015 |
| Bloomin' balsams | O'Brien, Seamus | Article in Journal | | 2010 |
| Bobby Sands, freedom fighter | Hunt, Gerry | Monograph or Collective Volume | O'Brien Press | 2016 |
| Bold, brilliant and bad: Irish women from history | Broderick, Marian | Monograph or Collective Volume | O'Brien Press | 2018 |
| Boulder-burials : a later bronze age megalith tradition in south-west Ireland | O'Brien, William | Article in Journal | | 1992 |
| Break-out : great prison escapes | Hayes, Patrick | Monograph or Collective Volume | O'Brien Press | 2004 |
| Brendan the navigator : exploring the ancient world | Simms, George Otto | Monograph or Collective Volume | O'Brien Press | 1989 |
| Brian Boru and Bealach Leachta | O'Brien, B. | Article in Journal | | 1991 |
| Bristol apprentices from Youghal, 1532-1565 | O'Brien, Niall | Article in Journal | | 2010 |
| British brutality in Ireland | O'Brien, JackO'Dwyer, Paul | Monograph or Collective Volume | Mercier Press | 1989 |
| British Israelites, Irish Israelites, and the ends of an analogy | Bender, Abby | Article in Book | | 2018 |
| Broadcasting and public policy : personal reflections | Collins, Bob | Article in Book | | 2015 |
| Broadcasting and violence : the case for media restriction | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 2005 |
| Bronterre : a political biography of Bronterre O'Brien, 1804-64 | Plummer, Alfred | Monograph or Collective Volume | Allen & Unwin | 1971 |
| Bronze age copper mines at Callares Oughter and Carrigacat | O'Brien, William | Article in Journal | | 2003 |
| Bronze age copper mining at Boulyscillagh, Goleen | O'Brien, William | Article in Journal | | 2002 |
| Bronze age copper mining on Ballyrisode Hill | O'Brien, William | Article in Journal | | 2001 |
| Bronze age copper mining on Mount Gabriel | O'Brien, William | Article in Journal | | 1994 |
| Building dialectics: negotiating urban scenography in late Georgian Dublin | Lucey, Conor | Article in Book | | 2012 |
| Buildings and architecture | FitzPatrick, ElizabethWalsh, Paul | Article in Book | | 2004 |
| Buildings of Irish towns : treasures of everyday architecture | Shaffrey, MauraShaffrey, Patrick | Monograph or Collective Volume | O'Brien Press | 1983 |
| Buildings of the Irish countryside : everyday architecture in the rural landscape | Shaffrey, Patrick | Monograph or Collective Volume | O'Brien Press | 1984 |
| Bully's Acre : Dublin's oldest cemetery | O'Brien, Paul | Monograph or Collective Volume | Kilmainham Tales | 2011 |
| Bunratty Castle : a short history | Lynch, Christopher | Article in Journal | | 1977 |
| Bunú Choláiste Uí Chomhraí | Seoighe, Mainchín | Article in Book | | 1995 |
| Burial in early medieval Ireland : politics and religion | Bhreathnach, EdelO'Brien, Elizabeth | Article in Book | | 2013 |
| Burial practices in Ireland : first to seventh centuries AD | O'Brien, Elizabeth | Article in Book | | 2003 |
| Burrowes of O'Brien Street. A hardware shop for generations | Myers, Kevin | Article in Journal | | 2004 |
| Business history | O'Brien, John | Article in Journal | | 1972 |
| Bygone days in Lackagh | O'Brien, Nollaig | Article in Journal | | 1994 |
| Calling the tune : the media, the state and the public's right to know | Shaw, Helen | Article in Book | | 2005 |
| Camden and the move towards union 1795-1798 | O'Brien, Gillian | Article in Book | | 2001 |
| Canon and martial law : William O'Brien, catholicism and Irish nationalism | Newsinger, John | Article in Journal | | 1981 |
| Canon Sheehan of Doneraile, 1852-1913 : outlines for a literary biography | O'Brien, James | Monograph or Collective Volume | Smenos | 2013 |
| Capital punishment in Ireland, 1922-1964 | O'Brien, Gerard | Article in Book | | 2006 |
| Captain Daniel Desmond Sheehan; an introductory essay | O'Donovan, John | Article in Journal | | 2015 |
| Captain Halpin's great eastern voyage | O'Brien, Andrew | Article in Journal | | 2004 |
| Captain Jeremiah O'Brien of Machias, Maine | Cahill, Thomas | Article in Journal | | 1938 |
| Captain John O'Brien of Machias, Maine - revolutionary hero - a biographical sketch | Sherman, Andrew M. | Article in Journal | | 1910 |
| Captain Laurence O'Brien 1842-1923 | Oswald, Charles F. | Article in Journal | | 1924 |
| Captain Patrick O'Flynn, friend of general George Washington | O'Brien, Michael J. | Article in Journal | | 1922 |
| Captain Robert Halpin's worldwide web | O'Brien, Andrew | Article in Journal | | 2003 |
| Capturing diversity whilst creating canon: the advent of sound recording in Irish traditional music | Moran, Jimmy O'Brien | Article in Book | | 2012 |
| Cashel Antiquities rediscovered - standing stones | O'Brien, Richard | Article in Journal | | 2006 |
| Castledargan : a middle-sized Sligo landed estate | O'Brien, Patrick E. | Article in Book | | 2024 |
| Castlefergus, or Ballyhannon Castle - a living stronghold | Breen, MartinUa Cróinín, Risteárd | Article in Journal | | 2014 |
| Castlehaven's Munster campaign of 1645 | McCarthy, Patrick | Article in Journal | | 2021 |
| Cath Cnoc na nOIs sa bhéaloideas | Tóibín, Feena | Article in Journal | | 2023 |
| Catherine A. O'Brien - stained-glass artist (with special reference to her work in Co. Kilkenny) | Brennan-Holohan, Mary P. | Article in Journal | | 1992 |
| Catherine Amelia O'Brien, artist in stained glass (1881-1963) | O'Connell, Gerald | Article in Book | | 2000 |
| Catholic and Protestant relations in Derry in the episcopacy of Charles O'Donnell 1798-1823 | Rafferty, Oliver P. | Article in Book | | 1999 |
| Catholic Fiction: Catholics in Fiction | Murphy, James H. | Article in Book | Oxford University Press | 2003 |
| Catholic Ireland in the Eighteenth Century. Collected Essays of Maureen Wall | Wall, Maureen (née Mac Geehin)
| Monograph or Collective Volume | Geography Publications | 1989 |
| Catholic participation in the diplomacy of the Southern Confederacy | Stock, Leo Francis | Article in Journal | | 1930 |
| Catholic Revivals in Britain and Ireland | Mangion, Carmen M. | Article in Book | Oxford University Press | 2023 |
| Catholics, Politics, and the State in Britain | McClelland, V. Alan | Article in Book | Oxford University Press | 2003 |
| Censorship and 'The Troubles' | Moloney, Ed, 1948- | Article in Book | | 2005 |
| Censorship, not 'self-censorship' | Kenny, Colum | Article in Book | | 2005 |
| Centenary year | Morrissey, Eamon | Article in Journal | | 2011 |
| Chain migration from Ireland to Australia: a case study from the slopes and foothills of the Galtees | O'Brien, Eileen M. | Article in Journal | | 2019 |
| Changes over the century | Cummins, Dan | Article in Book | | 2002 |
| Changing farming methods in County Derry 1700-1900 | Bell, Jonathan | Article in Book | | 1999 |
| Chapter of Irish charity in thanksgiving history | O'Brien, Michael J. | Article in Journal | | 1919 |
| Charles Gavan Duffy, 1816-1903 : rebel and statesman | O'Brien, Gerard | Article in Book | | 1992 |
| Charles O'Brien | Plunkett, Christy | Article in Journal | | 1995 |
| Charles O'Brien's agricultural survey of Kerry in 1800 | De Brún, PádraigMoyles, M. G. | Article in Journal | | 1969 |
| Charles O'Brien's agricultural survey of Kerry, 1800 (concluded) | O'Brien, Charles | Article in Journal | | 1969 |
| Charlotte Grace O'Brien | O'Connell, Anne | Article in Book | | 1995 |
| Charlotte Grace O'Brien | Joyce, Mannix | Article in Journal | | 1974 |
| Charlotte Grace O'Brien | Hamilton, Frank | Article in Journal | | 1985 |
| Charlotte Grace O'Brien and the Mission of Our Lady of the Rosary for the protection of Irish immigrant girls | Murphy, Maureen | Article in Journal | | 1992 |
| Chartism and Irish nationalism, 1829-48 : Bronterre O'Brien, the London Irish and attempts at a Chartist-Irish alliance. | Koseki, Takashi | Thesis | | 1988 |
| Childrens literature from County Longford 1760-1960 | O'Brien, Gearoid | Article in Journal | | 1980 |
| Christmas on the Galtees | O'Brien, William | Monograph or Collective Volume | L. Cusack | 2010 |
| Church and state in the Ireland of Míchél Ó Cléirigh | Edwards, R. W. D. (Robert Walter Dudley) | Article in Book | | 1944 |
| Church and State, and Nationalism in Ireland | Rafferty, Oliver P. | Article in Book | Oxford University Press | 2003 |
| Church of Ireland parish and people in Westmeath, 1897-1996 | Whiteside, Lesley | Article in Book | Geography Publications | 2022 |
| Churches of south-east county Dublin, seventh to twelfth century | O'Brien, Elizabeth | Article in Book | | 1988 |
| Clare : county of contrast | O'Brien, JohnSpellissy, Sean | Monograph or Collective Volume | The author | 1987 |
| Clashanimud Hillfort and Bronze Age warfare in Cork | O'Brien, William | Article in Journal | | 2014 |
| Clashmore and Cappagh in Medieval Times | O'Brien, Niall C.E.J. | Article in Journal | | 2018 |
| Class and conflict in pre-Famine Westmeath | Kenny, John | Article in Book | Geography Publications | 2022 |
| Classics, medievalism, and cultural politics in Myles na gCopaleen's Cruiskeen Lawn columns | O'Hogan, Cillian | Article in Book | | 2020 |
| Claude Auchinleck, 1884-1981 : military leader | Fraser, Thomas G. | Article in Book | | 1992 |
| Clearing the estates to fill the workhouses : King's County land agents and the Irish Poor Law Act, 1838 | Reilly, Ciarán J. | Article in Book | | 2011 |
| Client/Patron relationship in Munster, Sir William St Ledger and Murrough O'Brien 6th Baron Inchiquin 1632-1640 | O'Doherty, Leon | Article in Journal | | 2011 |
| Clio's daughters : essays on Irish women's history 1845 to 1939 | | Monograph or Collective Volume | University of Limerick Press | 1997 |
| Clonbonny : a centre of learning : [memory of life and lore in Clonbonny National School] | O'Brien, Gearoid | Monograph or Collective Volume | [s.n.] | 1995 |
| Clonmel apprentices in Bristol, 1541-1566 | O'Brien, Niall C. E. J. | Article in Journal | | 2019 |
| Clonmore Rectory in 1407 and doubts on the Calendar of Papal Letters | O'Brien, Niall C.E.J. | Article in Journal | | 2017 |
| Clouds on my windows : a Dublin memoir | O'Brien, May | Monograph or Collective Volume | Brandon | 2004 |
| Co. Wicklow | O'Brien, Andrew | Article in Journal | | 2000 |
| Collected thoughts on the salt industry and Sligo: 1700-1850 | O'Brien, Patrick E. | Article in Journal | | 2016 |
| Collins barracks, Cork | O'Brien, B. | Article in Journal | | 1965 |
| Colonel Burnaby | O'Brien, Eamon | Article in Journal | | 1992 |
| Colonel Marcus Maloney, U.S. Army | O'Brien, Michael J. | Article in Journal | | 1926 |
| Colonel Thomas James Kelly (1833-1908) and the "Bold Fenian Men | Tierney, Anne | Article in Journal | | 2008 |
| Comdt. Paddy O'Brien and north Cork's fight for freedom | O'Connell, Denis | Article in Journal | | 1991 |
| Commerce and the church : the factors that shaped new journalism in the Irish Independent | O'Brien, Mark : Rafter, Kevin | Article in Journal | | 2015 |
| Commercial relations between Aquitaine and Ireland c.1000 to c.1550 | O'Brien, A. F. | Article in Book | | 1995 |
| Commodore John Barry : father of the American navy | O'Brien, E. | Article in Journal | | 1968 |
| Communism in Dublin in the 1930s : the struggle against fascism | O'Riordan, Manus | Article in Book | | 1994 |
| Conditional Loyalties : Australia, Ireland, and the Decline of the Dominion Office | O'Brien, John B. | Monograph or Collective Volume | | 1990 |
| Conjuring complexities : essays on Flann O'Brien | | Monograph or Collective Volume | [s.n.] | 1997 |
| Connecting with Ulysses | Villiers, Eric | Article in Journal | | 2008 |
| Conor : a biography of Conor Cruise O'Brien | Akenson, Donald Harman | Monograph or Collective Volume | McGill-Queen's University Press | 1994 |
| Conor Cruise O'Brien : a Legon perspective | Kwapong, Alexander | Article in Book | | 1998 |
| Conor Cruise O'Brien : violent notions | Whelan, Diarmuid | Monograph or Collective Volume | Irish Academic Press | 2009 |
| Conor Cruise O'Brien agus an liobrálachas | Ó Glaisne, Risteárd, 1927-2003 | Monograph or Collective Volume | Clódhanna Teoranta | 1974 |
| Conor Cruise O'Brien and China | Yin, Xiao-huang | Article in Book | | 1998 |
| Conor Cruise O'Brien and nationalism | Whelan, Diarmuid | Thesis | | 1998 |
| Conor Cruise O'Brien and the activity of being an historian | Hanley, Hugh | Article in Journal | | 2025 |
| Conor Cruise O'Brien at the University of Cape Town : the great cacophony | Welsh, David | Article in Book | | 1998 |
| Conor Cruise O'Brien in the Congo | Manathunga, Catherine | Article in Book | | 1996 |
| Conor Cruise O'Brien introduces Ireland | | Monograph or Collective Volume | André Deutsch | 1969 |
| Conor Cruise O'Brien on 'la politesse de l'esprit' | O'Brien, Darcy | Article in Book | | 1998 |
| Conor Cruise O'Brien's Conservative Anti-Nationalism : Retrieving the Postwar European Connection | McNally, Mark | Article in Journal | | 2008 |
| Conor Cruise O’Brien and the Northern Ireland conflict : formulating a revisionist position | O'Callaghan, Margaret | Article in Journal | | 2018 |
| Conor Francis O'Brien, Connaught Ranger (1895-1969) | Reilly, Conor | Article in Journal | | 2001 |
| Conscience and conflict : a biography of Sir Dominic Corrigan 1802-1880 | O'Brien, Eoin | Monograph or Collective Volume | Glendale | 1983 |
| Constructing Ireland : culture and politics in Stanford's Shamus O'Brien | Hoover, Jean Marie | Article in Book | | 2000 |
| Contacts between Ireland and Anglo-Saxon England in the seventh century | O'Brien, Elizabeth | Article in Journal | | 1993 |
| Containing Granuaile : Grace O'Malley in two nineteenth-century novels | Maume, Patrick | Article in Journal | | 2015 |
| Contemporary "Caoineadh". Talking straight through the dead | O'Brien, Kathleen | Article in Journal | | 2006 |
| Contemporary prose in English : 1940-2000 | O'Brien, George, 1945- | Article in Book | | 2006 |
| Continuity and change : Donnchadh O'Brien, fourth earl of Thomond (d. 1624), and the anglicisation of the Thomond lordship | Cunningham, Bernadette | Article in Book | | 2008 |
| Contradiction and diversity : the musical life of Derry in the 1830 decade | McAllister, Nuala | Article in Book | | 1999 |
| Convicts, orphans, settlers : patterns of emigration from Ulster to Australia, 1790-1860 | Parkhill, Trevor | Article in Book | | 1991 |
| Cooper's Ireland : drawings and notes from an eighteenth-century gentleman | Harbison, Peter | Monograph or Collective Volume | The O'Brien Press in association with the National Library of Ireland | 2000 |
| Cork : historical perspectives with contributions by Gerard O'Brien and Eilis C. Stack | Jefferies, Henry A. | Monograph or Collective Volume | Four Courts | 2004 |
| Cork silver and gold : four centuries of craftsmanship | Bowen, John R.O'Brien, Conor, 1933- | Monograph or Collective Volume | Collins Press | 2005 |
| Cork society in the 1850s | O'Brien, John B. | Article in Journal | | 1996 |
| Cork women for Australia : assisted emigration, 1830-40 | O'Brien, Margaret | Article in Journal | | 1988 |
| Cornelius Merry and Matthew Clesson, pioneer Irish man of Northampton, Massachusetts | O'Brien, Michael Joseph | Article in Journal | | 1918 |
| Cornelius Merry and Matthew Clesson, pioneer Irishmen of Northampton, Mass. | O'Brien, Michael J. | Article in Journal | | 1918 |
| Cornelius O'Brien and the Cliffs of Moher | McIntyre, Perry | Article in Journal | | 2007 |
| Corpus genealogiarum Hiberniae, 1 | | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1962 |
| Correspondence of the superiors of the Jesuit mission in Ireland with John O'Brien, S.J., rector of Salamanca | | Article in Journal | | 1965 |
| Cosherers, wanderers and vagabonds : the treatment of the poor and insane in Ireland | O'Brien, Gerard | Article in Journal | | 1988 |
| Country girl : a memoir | O'Brien, Edna | Monograph or Collective Volume | Faber | 2012 |
| County Clare archives in the Irish Antiquities Division of the National Museum of Ireland : objects from the Parish of O'Brien's Bridge | Mac Conmara, TomásRattigan, John | Article in Journal | | 2005 |
| County Derry and New England : the Scotch Irish migration of 1718 | McCourt, Desmond | Article in Book | | 1999 |
| County Derry in the early historic period | Lacey, Brian | Article in Book | | 1999 |
| Cracking crime : Jim Donovan, forensic detective | O'Connor, Niamh | Monograph or Collective Volume | O'Brien Press | 2001 |
| Creator of Glanleam ... Sir Peter Fitzgerald and his Kerry garden | O'Brien, Seamus | Article in Journal | | 1999 |
| Creevelea Abbey | Kelly, Theresa | Article in Journal | | 2018 |
| Criminal libel, censorship and contempt of court : D. C. Boyd's editorship of the Waterford Standard | Keating, Anthony | Article in Book | | 2015 |
| Crioch Branach : the O'Byrnes and their country | Nicholls, K. W. (Kenneth W.) | Article in Book | | 1998 |
| Croach Patrick : a place of pilgrimage : a place of beauty | Hughes, Harry | Monograph or Collective Volume | O'Brien Press | 2018 |
| Crossfire : the batle of the Four Courts, 1916 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2012 |
| Crossing the Brosna at Mullingar : the early topography of the town and district | Gosling, Paul | Article in Book | Geography Publications | 2022 |
| Crown and Castle : British rule in Ireland, 1800-1830 | Brynn, E. | Monograph or Collective Volume | O'Brien Press | 1978 |
| Cúig teagaisg chríostaidhe de'n seachtmadh aois déag : compráid | Ó Fachtna, Anselm | Article in Book | NA | 1944 |
| Cultivating ‘the heavies or opinion-forming press’ : nation branding, Irish economic development and the British press, 1958–1966 | O'Brien, Mark | Article in Journal | | 2023 |
| Culture 2025 a national cultural policy framework for Ireland | Collins, PatrickO'Brien, Maria | Article in Journal | | 2020 |
| Culture, commodity, and Céad Míle Fáilte : U.S. and Irish tourist films as a vision of Ireland | O'Brien, Harvey | Article in Journal | | 2002 |
| Culture, democracy and public service broadcasting | Higgins, Michael D. | Article in Book | | 2005 |
| Dál Cais - church and dynasty | Ó Corráin, Donnchadh | Article in Journal | | 1973 |
| Dán do Shan Proinsias | Breatnach, R. A. | Article in Book | | 1944 |
| Dan Donnelly, 1788-1820 : pugilist, publican, playboy | Myler, Patrick | Monograph or Collective Volume | Lilliput | 2010 |
| Dance halls of romance and culchies in tuxedoes : Irish traditional music in America in the 1950s | Ó hAllmhuráin, Gearóid | Article in Book | | 2009 |
| Daniel Doyle: Young Irelander | Fenton, Laurence | Article in Journal | | 2015 |
| Daniel O'Donnell - my story | O'Donnell, DanRowley, Eddie | Monograph or Collective Volume | O'Brien Press|Virgin | 1999 |
| Dark times, Decent Men: stories of Irishmen in World War II | Richardson, Neil | Monograph or Collective Volume | O'Brien Press | 2012 |
| De Valera in America : the rebel president's 1919 campaign | Hannigan, Dave | Monograph or Collective Volume | O'Brien Press | 2008 |
| De Valera, Fianna Fail and the Irish Press : truth in the news? | O'Brien, Mark | Monograph or Collective Volume | Irish Academic Press | 2001 |
| Death in December : the story of Sophie Toscan du Plantier | Sheridan, Michael | Monograph or Collective Volume | O'Brien Press | 2002 |
| Death in December : the story of Sophie Troscan du Plantier | Sheridan, Michael | Monograph or Collective Volume | O'Brien | 2004 |
| Death in the city : Dublin 1916 | O'Brien, Paul | Article in Journal | | 2015 |
| Declaring the Irish republic : a reply to Conor Cruise O'Brien | MacBride, Seán, 1904-1988 | Article in Book | | 1982 |
| Decorative Dublin | Pearson, Peter | Monograph or Collective Volume | O'Brien Press | 2002 |
| Deep deception : Ireland's swimming scandals | McCarthy, Justine | Monograph or Collective Volume | O'Brien Press | 2010 |
| Denny Muschamp and the ploughlands of Grange | O'Brien, James | Article in Book | | 2013 |
| Dermod O'Brien : abroad and at home | Kennedy, S. B.Stewart, Anne, | Article in Journal | | 2007 |
| Dermot MacMurrough, 1110-71 | O'Brien, B. | Article in Journal | | 1972 |
| Derreen's N.S. - the early years | O'Brien, Breege | Article in Journal | | 1998 |
| Derry and Londonderry : history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 1999 |
| Derry diocese on the eve of the plantation | Jefferies, Henry A. | Article in Book | | 1999 |
| Derry, Iona, England and the governance of the Columban church | Dumville, David N. | Article in Book | | 1999 |
| Derrycarhoon: a bronze age copper mine in West Cork | Hogan, NickO'Brien, William | Article in Journal | | 2012 |
| Descent into hell : Operation 'market garden' | O'Brien, Paul | Article in Journal | | 2013 |
| Deserted villages of Kildownet | O'Brien, Breege | Article in Journal | | 1996 |
| Design and rule : women in the Irish countryside 1715-1831 | O'Kane, Finola | Article in Journal | | 2004 |
| Desmond Arthur 'The Montrose Ghost' | O'Brien, Patrick | Article in Journal | | 1994 |
| Devotional and Sacramental Cultures | Ryan, Salvador | Article in Book | Oxford University Press | 2023 |
| Devoy's post bag, 1871-1928. Vol. 1, 1871-80; vol. 2, 1880-1928 | | Monograph or Collective Volume | Fallon | 1953 |
| Digging up Dublin | | Monograph or Collective Volume | O'Brien Press | 1980 |
| Dirt, dwellings and culture : living conditions in early medieval Dublin. A case-study from Fishamble Street | Reilly, Eileen | Monograph or Collective Volume | Archaeopress | 2024 |
| Discover Cork | McCarthy, Kieran | Monograph or Collective Volume | O'Brien Press | 2003 |
| Discover Derry | Lacey, Brian | Monograph or Collective Volume | O'Brien Press | 1999 |
| Discover Galway | Walsh, Paul | Monograph or Collective Volume | O'Brien | 2001 |
| Discover Kilkenny | Bradley, John, 1954-2014 | Monograph or Collective Volume | O'Brien Press | 2000 |
| Discover Waterford | McEneaney, Eamonn | Monograph or Collective Volume | O'Brien | 2001 |
| Discrimination in Northern Ireland, 1920-1939 : myth or reality | O'Brien, John | Monograph or Collective Volume | Cambridge Scholars Publishing | 2010 |
| Disputed kinship among the Jacobite O'Briens in eighteenth-century France | Corp, Edward T. | Article in Journal | | 2018 |
| Divided nation undivided house : Labour and Tory policy in Northern Ireland | O'Brien, Michael Patrick | Article in Journal | | 1985 |
| Doctors Donnell and James Neylond and the O'Briens of Thomond 1530-1599 | Ó Dálaigh, Brian | Article in Journal | | 1991 |
| Documents from the Thomond Papers at Petworth House Archive [with index] | | Article in Journal | | 2011 |
| Dom Columba Marmion | O'Brien, Sylvester | Article in Journal | | 1931 |
| Don Juan O’Brien: An Irish Adventurer in Nineteenth-Century South America | Fanning, Tim | Monograph or Collective Volume | Cork University | 2020 |
| Donough O'Brien, fourth earl of Thomond | Maher, Peter | Article in Journal | | 1984 |
| Dooley : a family memoir | O'Brien, Kevin | Monograph or Collective Volume | Hero Books | 2022 |
| Douglas Hyde | Dillon, Myles | Article in Book | | 1960 |
| Dowd's history of Limerick | | Monograph or Collective Volume | O'Brien Press | 1990 |
| Dr. Butler and the Jerusalem pony | O'Brien, Pat | Article in Journal | | 2001 |
| Dr. John B O'Brien : historian, an appreciation | Anonymous | Article in Journal | | 2000 |
| Dublin 1913 : a divided city | Curriculum Development Unit | Monograph or Collective Volume | O'Brien Press | 1982 |
| Dublin 1913 : lockout and legacy | Granville, Gary | Monograph or Collective Volume | O'Brien Press | 2013 |
| Dublin : a grand tour | Guinness, DesmondO'Brien, Jacqueline | Monograph or Collective Volume | Weidenfeld and Nicolson | 1994 |
| Dublin : one thousand years | Conlin, Stephen | Monograph or Collective Volume | O'Brien Press | 1988 |
| Dublin and the Viking World | Clarke, Howard B.Dooley, SheilaJohnston, Ruth | Monograph or Collective Volume | O'Brien Press | 2018 |
| Dublin by design : architecture and the city | | Monograph or Collective Volume | O'Brien Press in association with the RIAI | 2020 |
| Dublin Castle and the Irish people | O'Brien, Richard Barry | Monograph or Collective Volume | Gill | 1909 |
| Dublin documentary | Kinsella, Thomas E. | Monograph or Collective Volume | O'Brien Press | 2006 |
| Dublin Fenianism in the 1880s : 'The Irish Culture of the Future?' | Kelly, Matthew | Article in Journal | | 2000 |
| Dublin in fiction of the later eighteenth century | Douglas, Aileen | Article in Book | | 2008 |
| Dublin in flames, 1922 | O'Brien, Paul | Article in Journal | | 2012 |
| Dublin's political underground in the 1790s | Smyth, Jim | Article in Book | | 1989 |
| Dublin, city of literature | Bolger, Muriel | Monograph or Collective Volume | O'Brien Press | 2011 |
| Dublin: The Making of a Medieval City | Clarke, Howard B.Dent, SarahJohnson, Ruth | Monograph or Collective Volume | O'Brien Press | 2019 |
| Dublinia : the story of medieval Dublin | Clarke, Howard B.Dent, SarahJohnson, Ruth | Monograph or Collective Volume | O'Brien Press | 2002 |
| Dun Laoghaire Kingstown | Brady, AnneGillman, DanielPearson, Peter | Monograph or Collective Volume | O'Brien Press | 1991 |
| Dunamase - the 'Acropolis' of Laois | O'Brien, Patrick Pascal | Article in Journal | | 2006 |
| Dunleckney vicarage underr challenge in 1486 | O'Brien, Niall | Article in Journal | | 2017 |
| Dynamism in a stagnating sector : the birth of Ireland's beef industry, 1950-60 | O'Brien, Declan | Article in Journal | | 2025 |
| Eamon Larkin, 1949-2011 | O'Brien, Dermot | Article in Journal | | 2011 |
| Earliest memories of the theatre in Athlone | O'Brien, Brendan | Article in Journal | | 1969 |
| Early brewing activity in Cork city | O'Brien, Ann | Article in Journal | | 2000 |
| Early days in Presentation College Bray, 1921-1933 | O'Brien, Malachy | Article in Journal | | 1990 |
| Early days of the garrison theatre in Athlone | O'Brien, Brendan | Article in Journal | | 1975 |
| Early ecclesiastical precincts and landscapes of Inishowen, County Donegal | Adams, MaxO'Brien, Colm | Article in Book | | 2016 |
| Early immigrants to Virginia (1623 to 1666) collected by George Cabell Greer, clerk, Virginia State Land Office, from the records of the Land Office , in Richmond | O'Brien, Michael J. | Article in Journal | | 1914 |
| Early industries in Killarney | Larner, JimO'Brien, William | Article in Book | | 2005 |
| Early Irish families in Virginia | O'Brien, M. J. | Article in Journal | | 1916 |
| Early Irish schoolmasters in New England | O'Brien, Michael J. | Article in Journal | | 1917 |
| Early Irish settlers at Worcester, Mass. | O'Brien, M. J.Towne, W. H. | Article in Journal | | 1919 |
| Early Irish settlers at Worcester, Mass. | O'Brien, Michael J. | Article in Journal | | 1919 |
| Early medieval burial on Tara - fact or fiction? | O'Brien, Elizabeth | Article in Book | | 2013 |
| Early medieval sentinel warrior burials | O'Brien, Elizabeth | Article in Journal | | 2008 |
| Early metal mining and its impact on the Irish landscape | O'Brien, B. | Article in Book | | 1996 |
| Early metalworking and myth on the lakes of Killarney | O'Brien, William | Article in Book | | 2003 |
| Early Pittsburgh, Pennsylvania | O'Brien, Michael J. | Article in Journal | | 1914 |
| Early records of Portsmouth, N. H. | O'Brien, Michael J. | Article in Journal | | 1914 |
| Easter | O'Brien, Nora Connolly | Article in Journal | | 1916 |
| Economic progress of Ireland, 1912-1962 | O'Brien, George, 1892-1973 | Article in Journal | | 1962 |
| Economy, growth and settlement in medieval Ireland | O'Brien, A. F. | Article in Journal | | 1994 |
| Edmund Burke | McCue, JimO'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | New Island Books | 1997 |
| Edmund Burke : Prophet against the tyranny of the politics of theory | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 2004 |
| Edmund Burke and the American revolution | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1980 |
| Edmund Burke as an Irishman | O'Brien, William | Monograph or Collective Volume | | 1924 |
| Edna O'Brien : "psychic and moral historian" | O'Connor, Maureen | Article in Book | | 2008 |
| Edna O'Brien, Irish dandy | O'Connor, Maureen | Article in Journal | | 2005 |
| Educated clergy in medieval Leighlin | O'Brien, Niuall C.E.J. | Article in Journal | | 2020 |
| Education and schooling | Whitehead, Maurice ; Raftery, Deirdre ; McDermid, Jane | Article in Book | Oxford University Press | 2023 |
| Education for the socially disadvantaged | O'Brien, Maeve | Article in Book | | 1990 |
| Edward Carson | McDowell, R. B. (Robert Brendan), 1913-2011 | Article in Book | | 1960 |
| El General O'Brien | Vicuna Mackenna, Benjamin | Article in Book | | 2006 |
| Elite courtship: the case of Mabel Smyly and Dermod O'Brien, 1901-2 | O'Riordan, Maeve | Article in Book | | 2015 |
| Elizabeth fort, Cork | McNamara, T. F.Mulcahy, MichaelO'Brien, B. | Article in Journal | | 1959 |
| Emmet and Shelley : high priests of romantic nationalism | O'Brien, Paul | Article in Book | | 2013 |
| Empire, history and emigration : from Enlightenment to liberalism | O'Brien, Karen | Article in Book | | 2010 |
| End of a liberal : the literary politics of Conor Cruise O'Brien | Lysaght, D. R. O'Connor | Monograph or Collective Volume | Plough Press | 1977 |
| Endurance : heroic journeys in Ireland | Somers, Dermot | Monograph or Collective Volume | O'Brien Books | 2005 |
| Enemy of the empire : life as an international undercover IRA activist | McGuire, Eamon | Monograph or Collective Volume | O'Brien Press | 2006 |
| Ennis abbey and the O'Brien tombs | Westropp, Thomas Johnston | Article in Journal | | 1895 |
| Ennis Friary:peaceful; present, bloody past | Rainsford, John | Article in Journal | | 2011 |
| Entries in a family diary | Byrne, Declan | Article in Journal | | 1998 |
| Eochair-sgiath an aifrinn ... : an explanatory defence of the mass. Edited by Patrick O'Brien | Keating, Geoffrey | Monograph or Collective Volume | | 1898 |
| Eoghan Ruadh Mac Uilliam Óig Mhic an Bháird | McGrath, Cuthbert | Article in Book | | 1944 |
| Episcopal appointments and ecclesiastical gravamina during Prince Edward's lordship of Ireland | O'Brien, Alphonsus | Thesis | | 1961 |
| Episcopal elections in Ireland, c.1254-72 | O'Brien, A. F. | Article in Journal | | 1973 |
| Episcopal Leaders and Leadership | Doyle, Peter | Article in Book | Oxford University Press | 2023 |
| Ernest Walton, 1903 - : atomic scientist | Cathcart, Brian | Article in Book | | 1992 |
| Escalating violence | Grant, R. | Article in Book | | 1985 |
| Essay in review. Engaging with an Irish intellectual | Ó Seaghdha, Barra | Article in Journal | | 2009 |
| Essays in honour of J. D. H. Widdess | | Monograph or Collective Volume | Cityview Press | 1978 |
| Estimating commodity substitution bias in the Irish inflation rate statistics during the financial crisis | Bermingham, ColinCoates, DermotO'Brien, Derry | Article in Journal | | 2016 |
| Estopped by Grand Playsaunce : Flann O'Brien's Post-colonial Lore | Brooker, Joseph | Article in Journal | | 2004 |
| Ethnic legacy and immigrant mobility : the new Irish and Irish America in the 1990s | O'Brien, Matthew J., 1968- | Article in Journal | | 2004 |
| Etymologica | O'Brien, Michael | Article in Book | | 1995 |
| Europe's first total Abstinence Society | Coombes, James | Article in Journal | | 2006 |
| Excavation of a multi-period burial site at Ballymacaward, Ballyshannon, Co. Donegal | O'Brien, Elizabeth | Article in Journal | | 1999 |
| Excavation of an early 17th-century glassmaking site at Glasshouse, Shinrone, Co. Offaly, Ireland | Farrelly, JeanFenwick, JoeGould, MalcolmMcCann, WilliamMeenan, RoseanneO'Brien, CaiminPaynter, SarahWillmott, Hugh | Article in Journal | | 2014 |
| Excavations at Barrack Street - French's Quay, Cork | O'Brien, Madeline | Article in Journal | | 1993 |
| Excavations at Dundrum Castle, Dundrum, Co. Dublin | O'Brien, Elizabeth | Article in Journal | | 1989 |
| Excavations at Moor Abbey, Co. Tipperary | Lynch, Ann | Article in Journal | | 2018 |
| Exegesis as argument : The use of Ephesians 2, 14 in Cummian's 'De controversia Paschali' | O'Brien, Conor | Article in Journal | | 2014 |
| Exiles and strangers : the case of the Wogans | D'Arcy, Frank | Article in Book | | 1989 |
| Exploring Newgrange | Mac Uistín, Liam | Monograph or Collective Volume | O'Brien Press | 2007 |
| Exploring the Book of Kells | Simms, George Otto | Monograph or Collective Volume | O'Brien Press | 1988 |
| Expressionism and the formative years : insights from the early diaries of Denis Johnston | O'Brien, John | Article in Journal | | 1989 |
| Extracts from - Court Case - Re; the Repatriation of the Manchester Martyrs to Ireland.- with the Bishop of Manchester. The Governor of Her Majesty Prison Manchester. The Chancellor of the Diocese of Manchester | Desmond, John | Article in Journal | | 2024 |
| Extracts from Virginia church records | O'Brien, Michael J. | Article in Journal | | 1919 |
| Eyewitness : four decades of northern life | Kelters, SeamusMurphy, Brendan | Monograph or Collective Volume | O'Brien Press | 2003 |
| Faeries, felons and fine gentlemen : a history of The Glen, Cork 1700-1980 | O'Brien, Gerard Martin | Monograph or Collective Volume | Blue Horse Press | 2022 |
| Fairs and pilgrimages | Gmelch, Sharon | Article in Book | | 1979 |
| Family and fortune in Kate O'Brien's Limerick | Logan, John | Article in Book | | 1994 |
| Famine and community in Mullingar poor law union, 1845-1849 : mud cabins and fat bullocks | O'Brien, Seamus | Monograph or Collective Volume | Irish Academic Press | 1999 |
| Famine in the county town - Mullingar 1845-49 | O'Brien, Seamus | Article in Book | Geography Publications | 2022 |
| Famine in the midlands : Mullingar Poor Law Union 1845-49 | O'Brien, Seamus | Article in Journal | | 2002 |
| Famine, entitlements and seduction : Captain Edmond Wynne in Ireland, 1846-51 | Fitzpatrick, David | Article in Journal | | 1995 |
| Famous Irish prisoners : 14, more about Smith O'Brien | Piondar, Sean | Article in Journal | | 1946 |
| Fatal journey : the murder of Trevor O'Keefe | Kelly, JaneO'Keefe, Eroline | Monograph or Collective Volume | O'Brien Press | 2006 |
| Father and son : a story of contrasts [Conor and Donough O'Brien of Leamaneh] | O'Reilly, Una | Article in Journal | | 1980 |
| Father Christopher Cusack and the Irish College of Douai, 1594-1624 | Brady, John, d.1963 | Article in Book | | 1944 |
| Father Thomas A. Finlay, S. J., 1848-1940 | O'Brien, George, 1892-1973 | Article in Journal | | 1940 |
| Father Tom Finlay | O'Brien, George, 1892-1973 | Article in Journal | | 1940 |
| Feagh McHugh and the Ulster princes : his role in their Dublin Castle escapes | Mac Eiteagáin, Darren | Article in Book | | 1998 |
| Feagh McHugh O'Byrne : firebrand of the Wicklow mountains | O'Brien, Conor, 1933- | Article in Journal | | 2000 |
| Fear of the collar : Artane industrial school, my extraordinary childhood | Touher, Patrick | Monograph or Collective Volume | O'Brien Press | 1991 |
| Fear of the collar : my terrifying childhood in Artane | Touher, Patrick | Monograph or Collective Volume | O'Brien Press | 2001 |
| Fenian and famous war correspondent : Edmond O'Donovan | O'Brien, Patrick | Article in Journal | | 1991 |
| Fenloe : a graveyard and a legend | O'Brien, Patrick | Article in Journal | | 1978 |
| Fergus O'Connor and J. Bronterre O'Brien | Briggs, Asa | Article in Book | | 1966 |
| Festival fever : the Irish at Cheltenham | Holland, Anne | Monograph or Collective Volume | O'Brien Press | 2017 |
| Field and shore; daily life, and traditions : Aran islands, 1900 | Curriculum Development Unit | Monograph or Collective Volume | O'Brien Press | 1977 |
| Field of fire : the battle of Ashbourne, 1916 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2012 |
| Fifty years of concessions to Ireland, 1831-1881. 2 vols. | O'Brien, R. B. | Monograph or Collective Volume | | 1883 |
| Fighting and writing : journalists and the 1916 Easter Rising | O'Brien, Mark | Article in Journal | | 2018 |
| Filíocht Ghaeilge na linne seo : staidéar criticiúil | O'Brien, Frank | Monograph or Collective Volume | [s.n.] | 1968 |
| First citizen : Mary McAleese and the Irish presidency | McGarry, Patsy | Monograph or Collective Volume | O'Brien | 2008 |
| Fish and chips and the 1916 Rising | O'Brien, Paul | Article in Journal | | 2012 |
| Fitz-James O'Brien | Murphy, Gerald | Article in Journal | | 2009 |
| Fitz-James O'Brien : a literary Bohemian of the eighteen-fifties | Wolle, Francis | Monograph or Collective Volume | University of Colorado Press | 1944 |
| Fitz-James O'Brien in Ireland and England, 1828-1851 | Wolle, Francis | Article in Journal | | 1942 |
| Fitzjames O'Brien; a playboy of the western world | Sullivan, A. M. | Article in Journal | | 1955 |
| Five cities | Shaffrey, Patrick | Article in Book | | 1979 |
| Five times arraigned for treason | O'Brien, Richard Barry | Article in Journal | | 1903 |
| Flann O'Brien (1911-1966) | Cronin, Anthony | Article in Book | | 2005 |
| Flann O'Brien : a critical introduction | Clissman, Anne | Monograph or Collective Volume | [s.n.] | 1975 |
| Flann O'Brien : a portrait of the artist as a young post-modernist | Hopper, Keith | Monograph or Collective Volume | Cork University Press | 1995 |
| Flann O'Brien : acting out | NA | Monograph or Collective Volume | Cork University Press | 2022 |
| Flann O'Brien's creative betrayal of Joyce | Harriman, Lucas | Article in Journal | | 2010 |
| Flat lands: Victorian legacy | O'Brien, Seamus | Article in Journal | | 2006 |
| Fled Bricrenn | O'Brien, M. A. (Michael Alphonsus) | Article in Book | | 1959 |
| Florentia monasteriorum | O'Brien, Caimin | Article in Journal | | 2009 |
| Following Conor | Edwards, Ruth Dudley | Article in Book | | 1998 |
| Food and famine : diet in County Londonderry 1820-1860 | Crawford, Margaret | Article in Book | | 1999 |
| For the liberty of Ireland at home and abroad | O'Brien, J.F.X. (James Francis Xavier), 1828-1905 | Monograph or Collective Volume | Univeristy College Dublin Press | 2010 |
| for Vincent O'Brien | McCormack, John | Article in Journal | | 1946 |
| Forest glass furnaces in County Offaly | Farrelly, JeanO'Brien, Caimin | Article in Journal | | 1997 |
| Forging a better world: socialists and international politics in the early twentieth century | Mulligan, William | Article in Book | | 2012 |
| Forging Irish cultural identity : the scholar-poets of Meath and their influence | Mac Gabhann, Séamus | Article in Book | | 2015 |
| Forgotten dreams : the life and times of Major J. G. "Ged" O'Dwyer | Toomey, Thomas | Monograph or Collective Volume | O'Brien-Toomey | 1995 |
| Forgotten revolution : Limerick Soviet 1919 : a threat to British power in Ireland | Cahill, Liam | Monograph or Collective Volume | O'Brien Press | 1990 |
| Fort Dunree museum | O'Brien, Joe | Article in Journal | | 2013 |
| Forth the banners go : reminiscences of William O'Brien, as told to Edward MacLysaght | O'Brien, William | Monograph or Collective Volume | Three Candles | 1969 |
| Four Limerick hedge-schoolmasters | Herbert, Robert | Article in Journal | | 1944 |
| Four roads to Dublin : the history of Ranelagh, Rathmines and Leeson Street | Kelly, Deirdre | Monograph or Collective Volume | O'Brien Press | 1995 |
| Fourth estate : Journalism in Twentieth-century Ireland | O'Brien, Mark | Monograph or Collective Volume | Manchester University Press | 2017 |
| Fr William Ferris's History of BallymacElligott: the book, the bishop and the ban | McCarthy, Brendan | Article in Journal | | 2019 |
| Fr. Paul O'Brien of Cormeen (1763-1820), folk-poet and Maynooth professor | Mac Gabhann, Séamus | Article in Journal | | 1999 |
| Francis McDonnell, a son of Erin, captured the English flag at Stony Point | O'Brien, Michael J. | Article in Journal | | 1922 |
| Francophobia in later eighteenth-century Irish history | O'Brien, Gerard | Article in Book | | 1990 |
| Frank Duff | O'Brien, Leon | Monograph or Collective Volume | Gill & Macmillan | 1982 |
| Freedom of angels : surviving Goldenbridge orphanage | Fahy, Bernadette | Monograph or Collective Volume | O'Brien Press | 1999 |
| From 'peace and freedom' to 'peace and quiet' : The Quiet Man as a product of the 1950s. | Hagan, Edward A. | Article in Book | | 2009 |
| From burial among the ancestors to burial among the saints: an assessment of some burial rites in Ireland from the Fifth to the Eighth centuries AD | O'Brien, Elizabeth | Article in Book | | 2016 |
| From Cregganbaun, Co. Mayo to Kiltoom, Co. Westmeath : a case-study of a Land Commission group migration scheme | Burke, Mary ; Burke, John | Article in Book | Geography Publications | 2022 |
| From earliest times | Raftery, Joseph | Article in Book | | 1979 |
| From Gaelic warlords to English country gentlemen, the O'Briens of Thomond, 1543-1741 | Ó Dálaigh, Brian | Article in Journal | | 2001 |
| From massification to globalisation : reflections on the transformation of Irish higher education | Gibson, AndrewHarkin, SiobhánHazelkorn, Ellen | Article in Book | | 2015 |
| From Richard Lalor Sheil to Leon Pinsker : The Jewish Question, the Irish Question, and a genealogy of hebrewphobia | Gilman, Sander L. | Article in Book | | 2018 |
| From the files of the DIB... Accidental nationalist hero | Maume, Patrick | Article in Journal | | 2009 |
| From three yachts, a cruiser's outlook | O'Brien, Conor | Monograph or Collective Volume | Arnold | 1928 |
| From William O'Brien to de Valera: John Herlihy (1863-1941), a forgotten editor | Maume, Patrick | Article in Journal | | 2013 |
| Fronded giants ... the exotic tree fern | O'Brien, Seamus | Article in Journal | | 1999 |
| Gaelic political assemblies and power-display in borderlands of Westmeath lordships | FitzPatrick, Elizabeth | Article in Book | Geography Publications | 2022 |
| Galway : a summary history | Walsh, Paul | Article in Book | | 2004 |
| Gaol/Gaol : re-viewing silence in Kilmainham Gaol | O'Brien, Kathleen | Article in Journal | | 1998 |
| Garranes : an early medieval royal site in south-west Ireland | | Monograph or Collective Volume | Archaeopress | 2021 |
| Garret Fitzgerald and the Fine Gael party | O'Brien, William | Article in Book | | 1986 |
| Geinealaigh Clainne Aodhagáin, A.D. 1400-1500 : ollamhain i bhféineachus is i bhfilidheacht | Ní Mhaol-Chróin, Caitlín | Article in Book | | 1944 |
| Gender in Irish writing | Cairns, D.O'Brien, Johnson T. | Monograph or Collective Volume | [s.n.] | 1991 |
| General O'Brien : West Wicklow to South America | | Monograph or Collective Volume | West Wicklow Historical Society | 2006 |
| George G. Higgins and the quest for worker justice : the evolution of Catholic social thought in America | O'Brien, John J. | Monograph or Collective Volume | Rowman & Littlefield | 2005 |
| George O'Brien : a biographical memoir | Meenan, James Francis | Monograph or Collective Volume | Gill & Macmillan | 1980 |
| George Washington's associations with the Irish | O'Brien, M. J. | Monograph or Collective Volume | P. J. Kennedy | 1937 |
| Georgian Dublin | | Monograph or Collective Volume | Four Courts | 2008 |
| Getting tough with RTE | Fisher, Desmond | Article in Book | | 2005 |
| Gigginstown and crown lands in Westmeath in the early 1800s | O'Neill, Timothy P. | Article in Book | Geography Publications | 2022 |
| Glanbane Hillfort and the bronze age in Kerry | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2016 |
| Glimpse of Portlaoise : a pictorial parade | | Monograph or Collective Volume | Leinster Express Newspapers | 1993 |
| Global players : Tony O'Reilly and Independent News and Media | Ellis, Gavin | Article in Book | | 2012 |
| God's architect : a life of Raymond McGrath, architectural analysis : Alan Powers, catalogue Raisonné Catherine Lawless, design Ted and Ursula O'Brien | O'Donovan, Donal | Monograph or Collective Volume | Kilbride Books | 1995 |
| Godland : reflections on religion and nationalism | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | [s.n.] | 1988 |
| Goodnight, God bless and safe home : the golden showband era | O'Keefe, Finbar | Monograph or Collective Volume | O'Brien Press | 2002 |
| Government, public broadcasting and the urge to censor | Corcoran, Farrel | Article in Book | | 2005 |
| Grattan's Home Rule, Gladstone's, and Asquith's | O'Brien, William | Monograph or Collective Volume | Free Press | 1915 |
| Great Irish houses and castles | Guinness, DesmondO'Brien, Jacqueline | Monograph or Collective Volume | Weidenfeld and Nicolson | 1992 |
| Green English : Ireland's influence on the English language | Todd, Loreto | Monograph or Collective Volume | O'Brien Press | 1999 |
| Growing up absurd : Edna O'Brien and 'The country girls' | Kiberd, Declan | Article in Book | | 2007 |
| Guests of a nation ; geists of a nation | O'Brien, Eugene | Article in Journal | | 2007 |
| Gunrunners : the covert arms trail to Ireland | Boyne, Sean | Monograph or Collective Volume | O'Brien Press | 2006 |
| Gur cake and coal blocks | Mac Thomáis, Éamonn, 1927-2002 | Monograph or Collective Volume | O'Brien Press | 1976 |
| H.B. Higgins : "one of those wild and irreconcilable Irishmen" | Rickard, John | Article in Book | | 1991 |
| H.B. Higgins : 'One of those wild and irreconcilable Irishmen' | Rikard, John | Article in Book | | 1991 |
| Hairdressing in the 1950s | O'Brien, Jo (Purcell) | Article in Journal | | 2011 |
| Handbook of Home Rule : being articles on the Irish question by the Right Hon. W.E. Gladstone, M.P., the Right Hon. John Morley, M.P., Lord Thring, James Bryce, M.P., Canon MacColl, E.L. Godkin, and R. Barry O'Brien | | Monograph or Collective Volume | | 1887 |
| Harry Kernoff, R.H.A. : 1900-1974 | O'Brien, Kevin | Article in Journal | | 1990 |
| Havoc : the auxiliaries in Ireland's War of Independence | O'Brien, Paul | Monograph or Collective Volume | Collins Press | 2017 |
| Heart and soul : a history of Saint Brendan's graveyard in Birr | Callaghan, StephenO'Brien, Caimin | Monograph or Collective Volume | Offaly County Council | 2016 |
| Heavy lifter or great news-hound? The editorship of Vincent Doyle, 1981-2005 | Breen, Joe | Article in Book | | 2012 |
| Heirs to the kingdom : Kerry's political dynasties | O'Shea, Owen | Monograph or Collective Volume | O'Brien | 2011 |
| Helen Waddell, 1889-1965 : scholar and author | Corrigan, Felicitas | Article in Book | | 1992 |
| Hell or some worse place : Kinsale 1601 | Ekin, Des | Monograph or Collective Volume | The O'Brien Press | 2018 |
| Henry Eoghan O'Brien : an engineer of nobility | Beesley, Gerald M. | Monograph or Collective Volume | Gerald M. Beesley | 2018 |
| Henry Eoghan O'Brien, D.S.O, B.Sc., M.A., M.I.C.E., M.I.Loco.E., M.I.C.E.I., an engineer of nobility | Beesley, Gerald | Monograph or Collective Volume | [The Author] | 2018 |
| Henry in China | O'Brien, Seamus | Article in Journal | | 2001 |
| Henry Philerin Hudson, MRIA: an Irish Macpherson? | Moran, Jimmy O'Brien | Article in Journal | | 2013 |
| Hercules Mulligan : confidential correspondent of George Washington | O'Brien, Michael | Monograph or Collective Volume | P. J. Kennedy | 1937 |
| Heritage houses of County Cork | Turk, Elena O'Brien ; Carroll, Miriam ; Quinn, Annette | Monograph or Collective Volume | Heritage Unit of Cork County Council | 2014 |
| Herod : reflections on political violence | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | [s.n.] | 1978 |
| Heuston, Sean | Gibney, John | Monograph or Collective Volume | O'Brien | 2013 |
| Hibernia : voices of dissent, 1968-80 | Trench, Brian | Article in Book | | 2014 |
| Hidden 'Celtic' Ireland : indigenous Iron Age settlements in the south-western peninsulas | O'Brien, William | Article in Book | | 2009 |
| Hidden soldier : an Irish Legionnarie's wars from Bosnia to Iraq | O'Keefe, PádraigRiegel, Ralph | Monograph or Collective Volume | O'Brien Press | 2007 |
| Hillforts, warfare and society in Bronze Age Ireland | O'Brien, William, 1961-
O'Driscoll, James | Monograph or Collective Volume | Archaeopress | 2017 |
| Historic Dublin : from walled town to Georgian capital | Conlin, Stephen | Monograph or Collective Volume | O'Brien Press | 1986 |
| Historic past preserved in a 21st century industrial setting | Garrihy, ColmanO'Brien, John | Article in Journal | | 2024 |
| Historical and literary representations of Brian Boru's burial in Armagh, 1014 AD | Casey, Denis | Article in Journal | | 2010 |
| Historical aspects of the occasion | Curtin, John McAuliffe | Article in Book | | 1987 |
| Historical memoir of the O'Briens | O'Donoghue, John | Monograph or Collective Volume | Martin Breen | 2002 |
| Historical memoir of the O'Briens | O'Donoghue, John | Monograph or Collective Volume | | 1860 |
| Histories of the Irish future | Fanning, Bryan | Monograph or Collective Volume | Bloomsbury | 2015 |
| History and environment | | Monograph or Collective Volume | University College Dublin: Lord Edward [Fitzgerald] Memorial Fund Board of Management | 1998 |
| History of an O'Brien stronghold : Clonroad, c.1210-1626 | Ó Dálaigh, Brian | Article in Journal | | 1987 |
| History of Kilbrittain Castle | | Article in Journal | | 2001 |
| History of Smith O'Brien G.A.A. club, Killaloe, 1886-1987 | Kierse, Sean | Monograph or Collective Volume | Boru Books | 1991 |
| History of the name O'Brien | Williams, James | Monograph or Collective Volume | Mercier Press | 1978 |
| History of the O'Briens from Brian Boroimhe, A.D. 1000 to A.D. 1946 | O'Brien, Donough | Monograph or Collective Volume | Batsford | 1949 |
| History's daughter : a memoir of the only child of Terence MacSwiney | Brugha, Máire MacSwiney, 1918- | Monograph or Collective Volume | O'Brien Press | 2005 |
| Holy Cross and Kilcooley: Two Holy Cross abbeys in Tipperary | O'Brien, Niall C.E.J. | Article in Journal | | 2023 |
| Home and belonging among Irish migrants : Transnational versus placed identities in 'The Light of Evening' abd 'Brooklyn: a novel' | Stoddard, Eve Walsh | Article in Journal | | 2012 |
| Home Rule, speeches of John Redmond, M.P. | O'Brien, R. B.Redmond, John | Monograph or Collective Volume | Fisher Unwin | 1910 |
| Honouring the dead | O'Brien, Paul | Article in Journal | | 2011 |
| Honouring the dead (Part 2) | O'Brien, Paul | Article in Journal | | 2011 |
| Honouring Tom Crean : a centenary expedition with the Crean family | O'Brien, Aileen CreanSheppard, Bill | Monograph or Collective Volume | Antarctic Kerryman Publishing | 2017 |
| Hostage : notorious Irish kidnappings | Howard, Paul | Monograph or Collective Volume | O'Brien Press | 2004 |
| Hot Press : 'a tilt at all of those windmills' | Breen, Joe | Article in Book | | 2014 |
| Housing and conflict : social change and collective action in Derry in the 1960s | Ó Dochartaigh, Niall | Article in Book | | 1999 |
| How Jeremiah McCaferty led Lord Cornwallis astray | O'Brien, Michael J. | Article in Journal | | 1926 |
| How the descendants of Irish settlers in America were written into history as "Anglo-Saxons" and "Scotch-Irish" | O'Brien, Michael J. | Article in Journal | | 1919 |
| How we were : in the parish of Kilbarron - Terryglass, Co. Tipperary | O'Brien, Bridie | Monograph or Collective Volume | Relay Books | 1999 |
| Humfrey Wanley, bishop John O'Brien, and the colophons of Mael Brigte's gospels | Sharpe, Richard | Article in Journal | | 2017 |
| Humphrey O'Sullivan (1853-1931) : inventor and son of Skibbereen | O'Brien, Gerald | Article in Journal | | 2014 |
| I know a lake where the cool waves break | Kearney, Terri | Article in Journal | | 2013 |
| I name this ship .... | O'Brien, Seán | Article in Journal | | 1996 |
| I was a boy in Belsen | Pierce, NicolaReichental, Tomi | Monograph or Collective Volume | O'Brien Press | 2011 |
| Ideas matter : essays in honour of Conor Cruise O'Brien | | Monograph or Collective Volume | Poolbeg | 1998 |
| Ideas matter : introduction | English, Richard, 1963-Skelly, Joseph Morrison | Article in Book | | 1998 |
| Ignoble Irishry : leprechauns and postwar satire | Rogers, James Silas | Article in Book | | 2009 |
| Illusion and reality in late eighteenth century politics | O'Brien, Gerard | Article in Journal | | 1988 |
| Illustrating a sentimental journey : Kate O’Brien’s Farewell Spain | Davison, Jane | Article in Journal | | 2017 |
| Images of Ardnacrusha : Photography, Electrical Technology, and Modernity in the Irish Free State | O'Brien, Sorcha | Article in Book | | 2009 |
| Imaginary Cassandra? Conor Cruise O'Brien as public intellectual in Ireland | Garvin, Tom | Article in Journal | | 2007 |
| Imagining Catholic Ireland : the nationalist press and the creation of national identity, 1843-1870 | O'Brien, William George | Thesis | | 2007 |
| Immigration, land, probate, administration, baptismal, marriage, burial, trade, military and other records of the Irish in America in the seventeenth and eighteenth century | O'Brien, Michael J. | Article in Journal | | 1915 |
| Immigration, land, probate, administration, birth, marriage and burial records of the Irish in America in and about the eighteenth century | O'Brien, Michael J. | Article in Journal | | 1914 |
| In a 'comity of cultures' : the rise and fall of the Irish Statesman, 1919-30 | d'Alton, Ian | Article in Book | | 2014 |
| In search of islands : a life of Conor O'Brien | Hill, Judith | Monograph or Collective Volume | Collins Press | 2009 |
| In the blood : Irish racing dynasties | Holland, Anne | Monograph or Collective Volume | O'Brien Press | 2010 |
| In the Fenians' wake : Ireland's nineteenth-century crises and their representation in the sentimental rhetoric of William O'Brien MP and Canon Sheehan | Maume, Patrick | Article in Journal | | 1998 |
| In the footsteps of the master | O'Brien, Seamus | Article in Journal | | 2004 |
| In the public interest? political sex scandals and the media in Ireland | O'Brien, Mark | Article in Journal | | 2022 |
| In the shadow of the national question | Laffan, Michael | Article in Book | | 2012 |
| In Tyrone's shadow : Feagh McHugh O'Byrne, forgotten leader of the Nine Years War | Edwards, David, 1963- | Article in Journal | | 1998 |
| In Wicklow, west Kerry and Connemara | Gmelch, GeorgeSaddlemyer, AnnSynge, John Millington, 1871-1909 | Monograph or Collective Volume | O'Brien Press | 1980 |
| Inchiquin and the war in Munster, 1646-1647 | McCarthy, Patrick | Article in Journal | | 2023 |
| Inchiquin's Sack of Cashel 1647 | O'Doherty, Leon | Article in Journal | | 2012 |
| Independence | Bulfin Winder, JeanneO'Brien, MichaelPey, Brian | Article in Book | | 2003 |
| Independent Newspapers and Irish society, 1973-98 | O'Brien, Mark | Article in Book | | 2012 |
| Independent newspapers: a history | O'Brien, Mark,Rafter, Kevin | Monograph or Collective Volume | Four Courts Press | 2012 |
| Industrial lives - social archaeology of the industrial period | O'Brien, Elena | Article in Journal | | 2005 |
| Industry and commerce in Athlone | Fitzgerald, Michael | Article in Book | | 1991 |
| Information, media and power through the ages | | Monograph or Collective Volume | University College Dublin Press | 2001 |
| Inishmurray : ancient monastic island | Heraughty, Patrick | Monograph or Collective Volume | O'Brien Press | 1982 |
| Inniscarra - My home place | O'Brien, Tim | Article in Journal | | 2013 |
| Inside the GPO 1916 : a first-hand account | Good, Joe | Monograph or Collective Volume | O'Brien | 1996 |
| Insider : Gerry Bradley's life in the IRA | Bradley, GerryFeeney, Brian | Monograph or Collective Volume | O'Brien Press | 2011 |
| Insider : Gerry Bradley's life in the IRA | Bradley, GerryFeeney, Brian | Monograph or Collective Volume | O'Brien Press | 2009 |
| Into the west : a fifth/sixth-century lady and her horse join the ancestors | O'Brien, Elizabeth | Article in Book | | 2016 |
| Into the wheatfield : the Union army's Irish brigade at Gettysburg | O'Brien, Kevin E. | Article in Journal | | 1995 |
| Introduction : beyond nationalism and complacency : the evolution of Thomas O'Brien | Klaus, H. Gustav | Article in Book | | 1994 |
| Introduction : critiquing crisis and commemoration | Flannery, EóinO'Brien, Eugene | Article in Journal | | 2022 |
| Introduction : political censorship and the democratic state | Corcoran, Mary P.O'Brien, Mark | Article in Book | | 2005 |
| Introduction: Critiquing crisis and commemoration | Flannery, Eóin ; O'Brien, Eugene | Article in Journal | | 2022 |
| Investigating mobility and migration in the later Irish Iron Age | O'Brien, ElizabethStandish, Christopher,Wilson, Jacqueline Cahill, | Article in Book | | 2014 |
| Ireland : conquest, settlement and colonisation | O'Brien, A. F. | Article in Book | | 1998 |
| Ireland and her people | O'Brien, Elinor | Monograph or Collective Volume | Lutterworth | 1970 |
| Ireland and Irishness in the political thought of Bronterre O'Brien | Turner, Michael J. | Article in Journal | | 2014 |
| Ireland and the Spanish Civil War, 1935 to 1939 | Bell, J. Bowyer | Article in Book | | 1994 |
| Ireland as a past life : Bridey Murphy and Irish-American tourism to Ireland, 1945-1960 | Rains, Stephanie | Article in Book | | 2009 |
| Ireland in international affairs | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1969 |
| Ireland in quotes : a history of the 20th century | O'Clery, Conor | Monograph or Collective Volume | O'Brien Press | 1999 |
| Ireland in the general elections (1826-1911) | O'Brien, Richard Barry | Article in Journal | | 1911 |
| Ireland in the modern world | MacBride, Seán, 1904-1988 | Article in Book | | 1979 |
| Ireland in theory : the influence of French theory on Irish cultural and societal development | O'Brien, Eugene | Article in Book | | 2004 |
| Ireland through the looking-glass : Flann O'Brien, Myles na gCopaleen and Irish cultural debate | Taaffe, Carol | Monograph or Collective Volume | Cork University Press | 2008 |
| Ireland under Charles II | Wilson, P. | Article in Book | | 1903 |
| Ireland under James II | Wilson, P. | Article in Book | | 1903 |
| Ireland's contribution to the evolution of Europe | O'Brien, Miriam Hederman | Article in Book | | 2000 |
| Ireland's Departure from the British Commonwealth | O'Brien, John B. | Article in Journal | | 1988 |
| Ireland's departure from the British Commonwealth | O'Brien, John B. | Article in Journal | | 2002 |
| Ireland's journey to the third way: a hi-social model? | Suiter, Jane | Article in Book | | 2012 |
| Ireland's pirate trail : a quest to uncover our swashbuckling past | Ekin, Des | Monograph or Collective Volume | The O'Brien Press | 2018 |
| Ireland's position in the world today | O'Brien, George, 1892-1973 | Article in Journal | | 1948 |
| Ireland's refugee policy, 1932-1950 | O'Brien, Geraldine Martina | Thesis | | 1998 |
| Ireland's war of Independence, 1919-21 : the IRA's guerrilla campaign | Collins, Lorcan | Monograph or Collective Volume | O'Brien Press | 2019 |
| Ireland, Europe and the world : writings on a new century | O'Brien, Dan | Monograph or Collective Volume | Gill & Macmillan | 2009 |
| Irish America, race, and Bernadette Devlin's 1969 American tour | O'Brien, Matthew J. | Article in Journal | | 2010 |
| Irish Americans in the Confederate Army | O'Brien, Sean Michael | Monograph or Collective Volume | McFarland & Company, Inc. | 2013 |
| Irish associational culture and identity in post-war Birmingham | O'Brien, Sarah | Thesis | | 2009 |
| Irish boundary Ferta, their physical manifestation and historical context | Bhreathnach, EdelO'Brien, Elizabeth | Article in Book | | 2011 |
| Irish countryside buildings : everyday architecture in the rural landscape. A companion volume to Buildings of Irish towns | Shaffrey, MauraShaffrey, Patrick | Monograph or Collective Volume | O'Brien Press | 1985 |
| Irish Diaspora | Barr, Colin | Article in Book | Oxford University Press | 2003 |
| Irish Exchequer records of payments of the fee farm of the city of Cork in the later middle ages | O'Brien, A. F. | Article in Journal | | 1998 |
| Irish fairy forts : portals to the past | Kerrigan, Jo | Monograph or Collective Volume | O'Brien Press | 2025 |
| Irish folk history : folktales from the North | Glassie, Henry | Monograph or Collective Volume | O'Brien Press | 1982 |
| Irish folk music collectors of the early nineteenth century : pioneer musicologists | Moran, Jimmy O'Brien | Article in Book | | 2007 |
| Irish follies and whimsical architecture | Munday, George | Monograph or Collective Volume | O'Brien Press | 2023 |
| Irish governmenrts and the guardianship of historical records, 1922-1972 | O'Brien, Gerard | Monograph or Collective Volume | Four Courts | 2004 |
| Irish hagiography : historiography and method | Ó Briain, Felim | Article in Book | | 1944 |
| Irish immigrants from English ports in the eighteenth century | O'Brien, M. J. | Article in Journal | | 1919 |
| Irish immigrants from English ports in the eighteenth century | O'Brien, Michael J. | Article in Journal | | 1919 |
| Irish immigrants to New England - extracts from the minutes of the selectmen of the town of Boston, Mass. | O'Brien, M. J. | Article in Journal | | 1914 |
| Irish immigrants to New England - extracts from the minutes of the selectmen of the town of Boston, Mass. | O'Brien, Michael J. | Article in Journal | | 1914 |
| Irish Life | | Monograph or Collective Volume | O'Brien Press | 1979 |
| Irish life and traditions | | Monograph or Collective Volume | O'Brien Press | 1986 |
| Irish mariners in New England | O'Brien, Michael J. | Article in Journal | | 1918 |
| Irish medical historiography | Lyons, J. B. (John Benignus) | Article in Book | | 1978 |
| Irish medicine : a visual perspective | O'Brien, Eoin | Article in Book | | 1992 |
| Irish New Yorkers and the Puerto Rican migration. | Anderson, Eileen | Article in Book | | 2009 |
| Irish origin-legends | O'Brien, M. A. (Michael Alphonsus) | Article in Book | | 1954 |
| Irish pioneers and schoolmasters in Butler County, Pennsylvania | O'Brien, Michael J. | Article in Journal | | 1919 |
| Irish pioneers in Delaware | O'Brien, Michael J. | Article in Journal | | 1919 |
| Irish pioneers in Hartford county, Connecticut : extracts from the land, church, probate and military records | O'Brien, M. J. | Article in Journal | | 1928 |
| Irish pioneers in New Hampshire | O'Brien, Michael J. | Article in Journal | | 1926 |
| Irish primary education in 1824 | Fitzgerald, Garret | Article in Book | | 2013 |
| Irish primary education in the early nineteenth century : an analysis of the first and second reports of the Commissioners of Irish Education Inquiry, 1825-6 | Fitzgerald, GarretO'Brien, GillianÓ Gráda, Cormac | Monograph or Collective Volume | Royal Irish Academy | 2013 |
| Irish public opinion and the risorgimento 1859-60 | O'Brien, Jennifer | Article in Journal | | 2005 |
| Irish public opinion and the Risorgimento, 1859-60 | O'Brien, Jennifer | Article in Book | | 2014 |
| Irish questions and Jewish questions: Crossovers in culture | | Monograph or Collective Volume | Syracuse University Press | 2018 |
| Irish rebellions | Litton, Helen | Monograph or Collective Volume | O'Brien Press | 2018 |
| Irish representations of Jews and Jewish responses/Jewish representations of Jews and Irish responses | Wynn, Natalie | Article in Book | | 2018 |
| Irish representations of Jews and Jewish responses/Jewish representations of Jews and Irish responses | Wynn, Natalie | Article in Book | | 2018 |
| Irish Republican propaganda and organisation in Germany, 1919-1923 | O'Brien, Jennifer | Thesis | | 2008 |
| Irish schoolmasters in the American colonies | O'Brien, Michael J. | Article in Journal | | 1926 |
| Irish settlers in America | O'Brien, Michael Joseph | Monograph or Collective Volume | Genealogical Publishing | 1979 |
| Irish settlers in Connecticut in the seventeenth and eighteenth centuries | O'Brien, M. J. | Article in Journal | | 1925 |
| Irish settlers in Connecticut in the seventeenth centuries | O'Brien, Michael J. | Article in Journal | | 1925 |
| Irish settlers in Orange county, New York | O'Brien, M. J. | Article in Journal | | 1928 |
| Irish settlers in Pennsylvania | O'Brien, M. J. | Article in Journal | | 1906 |
| Irish settlers in Queen's county, city of New York | O'Brien, M. J. | Article in Journal | | 1928 |
| Irish stone walls : history, building and conservation | McAfee, Patrick | Monograph or Collective Volume | O'Brien Press | 1997 |
| Irish students in the University of Louvain | Jennings, Brendan | Article in Book | | 1944 |
| Irish thatched cottages : a living tradition | Byrne, Emma | Monograph or Collective Volume | O'Brien Press | 2022 |
| Irish voices in nineteenth-century English street ballads | O'Brien, Ellen L. | Article in Journal | | 2002 |
| Irish women’s involvement in Birmingham’s union of Catholic mothers, 1948–1978 | O'Brien, Sarah | Article in Journal | | 2013 |
| Irish work-house children in Australia | Collingwood, Judy | Article in Book | | 1991 |
| Irish, Jewish, or both: Hybrid identities of David Marcus, Stanley Price, and myself | Bornstein, George | Article in Book | | 2018 |
| Irish-American politics in the mid-twentieth century | O'Brien, Matthew J. | Article in Book | | 2024 |
| Irish-Ireland and Catholic Whiggery : D.P. Moran and The Leader | Maume, Patrick | Article in Book | | 2014 |
| Irishness and exile in Edna O'Brien's 'Wild Decembers' and 'In the Forest' | Slivka, Jennifer A. | Article in Journal | | 2013 |
| Iron age burial practices in Leinster : continuity and change | O'Brien, Elizabeth | Article in Journal | | 1990 |
| Island living : the modern story of life on the Black Islands on Lough Ree | O'Brien, Gearoid | Article in Journal | | 2013 |
| Island living : the modern story of life on the islands of Lough Ree | O'Brien, Gearoid | Article in Book | | 2015 |
| Islandmore | O'Brien, Brigid | Article in Journal | | 1986 |
| J.F.X. O'Brien, M.P. (1828-1905) | Nolan, Peter | Thesis | | 1971 |
| James Bronterre O'Brien : a forgotten radical | Kelly, James, 1959- | Article in Journal | | 1978 |
| James Connolly | Collins, Lorcan | Monograph or Collective Volume | The O'Brien Press | 2012 |
| James Connolly and Patrick Pearse | MacArdle, Dorothy | Article in Book | | 1960 |
| James Connolly's farewell | Connolly, Nora | Article in Book | | 2016 |
| James Fintan Lalor of Tinnakill | O'Brien, Michael | Article in Book | | 1999 |
| James Francis Xavier O'Brien (1828-1905) : Dungarvan born Fenian | McCarthy, Patrick | Article in Journal | | 1998 |
| Jane's castle sketches | Breen, MartinRowe, Veronica | Article in Journal | | 2014 |
| Janey Mack, my shirt is black | Mac Thomáis, Éamonn, 1927-2002 | Monograph or Collective Volume | O'Brien Press | 1982 |
| Jellett, O'Brien, Purser and Stokes : seven generations, four families | Purser, Michael | Monograph or Collective Volume | Prejmer Verlay | 2004 |
| Jerpoint Abbey in the Calendar of Papal Registers | O'Brien, Niall, C.E.J. | Article in Journal | | 2016 |
| Joe Cahill : a life in the IRA | Anderson, Brendan | Monograph or Collective Volume | O'Brien Press | 2002 |
| Joey Dunlop : King of the roads | Davison, Stephen | Monograph or Collective Volume | O'Brien Press | 2000 |
| John Abernethy, scholar and ecclesiast | Brown, A. G. | Article in Book | | 1992 |
| John Bull's famous circus : Ulster history through the postcard, 1905-1985 | Killen, John | Monograph or Collective Volume | O'Brien | 1985 |
| John Charles McQuaid : ruler of Catholic Ireland | Cooney, John | Monograph or Collective Volume | O'Brien Press | 1999 |
| John Dunlap, c.1746-1812 : printer | McCaughey, Roy | Article in Book | | 1992 |
| John Hunt : the man, the medievalist, the connoisseur | O'Connell, Brian | Monograph or Collective Volume | O'Brien Press | 2013 |
| John Lavery, 1856-1941 : painter | McConkey, Kenneth | Article in Book | | 1992 |
| John Longfield of Mallow and Cloyne - a narrative | O'Brien, Pat | Article in Journal | | 2018 |
| John McCormack and Athlone : a biographical sketch of a great Irish tenor | O'Brien, Gearoid | Monograph or Collective Volume | Old Athlone Society | 1992 |
| John McCormack, 1884-1945 | O'Brien, Vincent, 1917- | Article in Journal | | 1947 |
| John O'Brien : the early years | Lawlor, Chris | Article in Book | | 2006 |
| John O'Donnell MP - The Voice of the Irish Peasant | Ó Domhnaill, Rónán Gearóid | Article in Journal | | 2023 |
| John Redmond | Mansergh, Nicholas, 1910-1991 | Article in Book | | 1960 |
| John, Baron O'Brien, count of Thomond | Garland, J. L. | Article in Journal | | 1955 |
| Johnny Ridge: the last of the Tuam Krugers | O'Brien, Mairead | Article in Journal | | 2015 |
| Joseph Plunkett | Ó Brolcháin, Honor | Monograph or Collective Volume | O'Brien Press | 2012 |
| Joseph Smith Sheehan, a Corkman with a picturesque career | Moorhead, Patricia | Article in Journal | | 2000 |
| Journalism studies and 'the crisis' of journalism | Conboy, Martin | Article in Book | | 2015 |
| Kate O'Brien (1897-1974) | Meaney, Gerardine | Article in Book | NA | 2005 |
| Kate O'Brien : a critical study | Dalsimer, Adele M. | Monograph or Collective Volume | [s.n.] | 1990 |
| Kate O'Brien : a literary portrait | Reynolds, Lorna | Monograph or Collective Volume | [s.n.] | 1987 |
| Kate O'Brien : a writing life | Walshe, Eibhear | Monograph or Collective Volume | Irish Academic Press | 2006 |
| Kate O'Brien and the Erotics of Liberal Catholic Dissent | Cronin, Michael | Article in Journal | | 2010 |
| Kate O'Brien in the Theatre | Moran, James | Article in Journal | | 2018 |
| Kate O'Brien's Limerick | Kemmy, Jim | Article in Journal | | 1984 |
| Kate O'Brien's subtle critique of Franco's Spain and de Valera's Ireland, 1936-1946 | Mittermaier, Ute Anna | Article in Book | | 2015 |
| Kate O'Brien, convents and class | Clear, Caitriona | Article in Book | | 2009 |
| Kathleen Clarke : revolutionary woman | Clarke, KathleenLitton, Helen | Monograph or Collective Volume | O'Brien Press | 2008 |
| Keeping it real : Irish film and television | | Monograph or Collective Volume | Wallflower | 2004 |
| Kendal E. O'Brien: Fenian, Mid-Tipperary's M.P. and the voice of rural labour, 1849-1909 | Lane, Padraig G. | Article in Journal | | 2013 |
| Kicking and screaming : dragging Ireland into the 21st century | Bacik, Ivana | Monograph or Collective Volume | O'Brien Press | 2004 |
| KIlkenny apprentices at Bristol, 1532-1545 | O'Brien, Niall C.E.J. | Article in Journal | | 2018 |
| Killarney in prehistoric times | O'Brien, William | Article in Book | | 2001 |
| Killing Finucane : murder in defence of the realm | O'Brien, Justin | Monograph or Collective Volume | Gill & Macmillan | 2005 |
| Kilross Civil Parish in 1749: a microcosm of 18th-century Sligo? | O'Brien, Pat | Article in Journal | | 2018 |
| Kinane : a remarkable racing family | Holland, Anne | Monograph or Collective Volume | O'Brien | 2010 |
| Kings and vassals in later medieval Ireland : the Uí Bhriain and the MicConmara in the fourteenth century | Nic Ghiollamhaith, Aoife | Article in Book | | 1995 |
| Kings of September : the day Offaly denied Kerry five in a row | Foley, Michael | Monograph or Collective Volume | O'Brien Press | 2007 |
| Kitsch, enchantment and power : the bleeding statues of Templemore in 1920 | Wilson, Ann | Article in Book | Bloomsbury Press | 2014 |
| Knockatreenane and the prehistoric barrows of county Cork | O'Brien, William | Article in Journal | | 2010 |
| La ville de New York vue par les nationalistes irlandais dans la seconde moitié du XIXe siècle | Saison, Ghislaine | Article in Book | | 2000 |
| Labour and Dáil Éireann, 1922-32 | Meehan, Ciara | Article in Book | | 2012 |
| Labour and Easter Week : a selection from the writings of James Connolly | Connolly, James, 1868-1916 | Monograph or Collective Volume | Three Candles | 1950 |
| Labour and Europe: from no to yes | Collins, Stephen | Article in Book | | 2012 |
| Labour and the liberal agenda | Bacik, Ivana | Article in Book | | 2012 |
| Labour and the making of Irish foreign policy, 1973-77 | O'Halpin, Eunan | Article in Book | | 2012 |
| Labour and the media: the promise of socialism, negative campaigning and the Irish Times | Rafter, Kevin | Article in Book | | 2012 |
| Labour and the pursuit of power | Daly, Paul | Article in Book | | 2012 |
| Lakyle School : the old and the new : a centenary celebration | O'Brien, Alfie | Monograph or Collective Volume | Lakyle NS | 2009 |
| Land bounty certificates in Virginia | O'Brien, Michael J. | Article in Journal | | 1926 |
| Land grants to Irish settlers in the colony and state of Virginia | O'Brien, Michael J. | Article in Journal | | 1925 |
| Land of my cradle days | Morrissey, Martin | Monograph or Collective Volume | O'Brien Press | 1990 |
| Land reform in Ireland : a legal history of the Irish land problem and its settlement | Kolbert, C. F.O'Brien, T. | Monograph or Collective Volume | University of Cambridge | 1975 |
| Landscape development in north-west and south-east Derry 1700-1840 | Currie, E. A. | Article in Book | | 1999 |
| Language, monuments and the politics of memory in Quebec and Ireland | O'Brien, Kathleen | Article in Journal | | 2003 |
| Language, monuments, and the politics of memory in Quebec and Ireland | O'Brien, Kathleen | Article in Journal | | 2003 |
| Lansdowne Road : the stadium ; the matches ; the greatest days | Clerkin, MalachySiggins, Gerard | Monograph or Collective Volume | O'Brien Press | 2010 |
| Last man standing : hurling goalkeepers | O'Connor, Christy | Monograph or Collective Volume | O'Brien Press | 2005 |
| Leadership and localism in Irish politics : some reflections | Lee, J.J. (John Joseph), 1942- | Article in Book | | 2015 |
| Leamanach and Dromoland : the O'Brien Ambition Part II. 'Obliges, me to dip my Hands in Mortar' : Catherine O'Brien's influence at Dromoland | O'Kane, Finola | Article in Journal | | 2004 |
| Leamanach and Dromoland : the O'Brien ambition, part I. 'Improvements . . .not so inconsiderable' : the O'Briens' baroque landscape at Leamanach Castle, County Clare | O'Kane, Finola | Article in Journal | | 2004 |
| Leamanch : an O'Brien castle and manor house | Gosling, PaulO'Connell, Jeffrey | Article in Book | | 1991 |
| Legendary Ireland : a journey through Celtic place and myths | Massey, Eithne | Monograph or Collective Volume | O'Brien Press | 2003 |
| Les autobiograpies de Conor Cruise O'Brien : a cruisocentric history of Ireland | Goldring, Maurice | Article in Book | | 2004 |
| Letter of Connor O'Brien to Charles V, 1534 | O'Brien, Connor | Article in Book | | 1998 |
| Letters concerning the trade and manufactures of Ireland, principally so far as the same relate to the making of iron in this kingdom | O'Brien, Lucius, Sir | Monograph or Collective Volume | | 1785 |
| Letters of Irish interest | | Article in Journal | | 1948 |
| Letters, speeches and tracts on Irish affairs | Arnold, MatthewBurke, Edmund, 1729-1797O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | Cresset P. | 1988 |
| Liam O'Flaherty | O'Brien, James H. | Monograph or Collective Volume | Bucknell University Press | 1973 |
| Life and Letters of Thomas Drummond | O'Brien, R. B. | Monograph or Collective Volume | | 1889 |
| Life at home | McDonnell, EilishMcDonnell, Pat | Article in Book | | 2002 |
| Life of Dean O'Brien, founder of the C.Y.M.S. | Egan, Mary Joan | Monograph or Collective Volume | C.Y.M.S. | 1948 |
| Life of General Juan O'Brien : hero of South American independence. Irish by birth, Chilean by adoption | Pablo Figueroa, Pedro | Article in Book | | 2006 |
| Life of St Finbarr : founder and patron of the city and diocese of Cork | O'Brien, C. M. | Monograph or Collective Volume | Killarney Printing Works | 1985 |
| Life sentence : murder victims and their families | Cleary, Catherine | Monograph or Collective Volume | O'Brien Press | 2004 |
| Light years ago : a study of the cairns of Newgrange and cairn T, Loughcrew, Co. Meath, Ireland | O'Brien, Timothy | Monograph or Collective Volume | Black Cat Press | 1992 |
| Limerick | O'Brien, Kathleen | Article in Journal | | 1980 |
| Limerick the rich land | Spellissy, Sean | Monograph or Collective Volume | Spellissy-O'Brien | 1989 |
| Lisnamanroe and the early medieval 'royal site' at Garranes, Co. Cork | Hogan, NickO'Brien, William | Article in Journal | | 2020 |
| Literary Insights into the Basis of Some Burial Practices in Ireland and Anglo-Saxon England in the Seventh and Eighth Centuries | O'Brien, Elizabeth | Article in Book | | 2008 |
| Lives of Victorian political figures : part II | | Monograph or Collective Volume | Pickering & Chatto | 2007 |
| Local government in County Westmeath (1542-2019) | Potter, Matthew | Article in Book | Geography Publications | 2022 |
| Local studies in the County Library Service in 2016 | O'Brien, Gearóid | Article in Journal | | 2017 |
| Local traditions : place-names | O'Brien, M. A. (Michael Alphonsus) | Article in Book | | 1957 |
| Local worlds : early settlement landscapes and upland farming in south-west Ireland | O'Brien, William | Monograph or Collective Volume | Collins Press | 2009 |
| Locating women within the Irish Department of External Affairs : a case study of Irish women at the League of Nations and United Nations, 1923-76 | O'Brien, Ann Marie | Article in Journal | | 2019 |
| Lockwood and after | O'Brien, Gerard | Article in Book | | 2009 |
| Loinseoir na Saoirse : scéal Conor O'Brien | De Bhaldraithe, Pádraig | Monograph or Collective Volume | Coiscéim | 1996 |
| Londonderry and Coleraine : walled towns or epitome | Thomas, Avril | Article in Book | | 1999 |
| Looking over my shoulder : life for an O’Brien family from the townland of Carrownakilly in 19th-century Ireland | O’Brien, Patrick M., 1953- | Monograph or Collective Volume | [The author] | 2014 |
| Looking under stones : roots, family and a Dingle childhood | O'Toole, Joe | Monograph or Collective Volume | O'Brien Press | 2003 |
| Lord Camden in Ireland, 1795-8 : a study in Anglo-Irish relations | O'Brien, Gillian | Thesis | | |
| Lord Cornbury, governor of New York 1702-08, probably the first recorded transvestite in Anglo-American history | O'Brien, Ivor | Article in Journal | | 2000 |
| Lord Inchiquin and the Munster clergy, 1643-9 | Little, Patrick | Article in Book | Four Courts Press | 2025 |
| Lord Milner's Irish journal, 1886 | O'Brien, T. H. | Article in Journal | | 1964 |
| Lord of the files. Working for the government : an anthology | | Monograph or Collective Volume | Institute of Public Administration | 2011 |
| Lough Ree and its islands | Cahill, SeanCasey, JimmyO'Brien, Gearoid | Monograph or Collective Volume | Three Counties Press | 2006 |
| Lucius and Catherine O'Brien of Corofin | MacMahon, Michael | Article in Journal | | 2001 |
| Luggala during the Famine years | O'Brien, Pat | Article in Journal | | 2003 |
| M. Edouart in Bandon 1835 | O'Brien, Damien | Article in Journal | | 1997 |
| Macroom castle and estate once owned by Judge Bernard | O'Brien, B. | Article in Journal | | 1993 |
| Magh Adhair, inauguration place of the kings of Thomond | Ryan, Martin | Article in Journal | | 1977 |
| Máire Rua : lady of Leamaneh | MacNeill, MáireMurphy, Maureen | Monograph or Collective Volume | Ballinkella Press | 1990 |
| Máire Rua : lady of Leamaneh. | MacNeill, MáireMurphy, Maureen | Monograph or Collective Volume | Ballinkella Press | 1990 |
| Major Patrick Carr and captain Patrick McGriff, two gallant officers of the Georgia continental line | O'Brien, Michael J. | Article in Journal | | 1922 |
| Making the difference? The Irish Labour party, 1912-2012 | | Monograph or Collective Volume | The Collins Press | 2012 |
| Making their mark | Griffith, AngelaHodge, Anne | Article in Journal | | 2019 |
| Mallow Volunteers 1913-1916 | Rutherford, Colman | Article in Journal | | 2016 |
| Mannix, de Valera and Irish nationalism | Keogh, Dermot | Article in Book | | 1991 |
| Maoilín Óg Mac Bruaideadha and the decline of patronage | Ó Macháin, Pádraig | Article in Journal | | 2020 |
| Mapping Death
Burial in Late Iron Age and Early Medieval Ireland | O'Brien, Elizabeth | Monograph or Collective Volume | Four Courts | 2020 |
| Margaret Thatcher's Irish legacy : the background and significance of the Anglo-Irish agreement | O'Brien, Martin | Article in Book | | 1995 |
| Markievicz the rebel countess | Moriarty, MarySweeney, Catherine | Monograph or Collective Volume | O'Brien Press | 1991 |
| Marking time | O'Kane, Marianne | Article in Journal | | 2004 |
| Marriage notices published in the South Carolina Gazette | O'Brien, Michael J. | Article in Journal | | 1926 |
| Mary Anne O'Brien: How a Limerick City woman established the Convent of Mercy, Newport, Co. Tipperary | Phayer, John | Article in Journal | | 2024 |
| Mary Robinson : an independent voice | Horgan, John, b. 1940 | Monograph or Collective Volume | O'Brien Press | 1997 |
| Master James O'Brien 1910-1947. Teacher for 37 years honoured by past pupils | Power, John | Article in Journal | | 2011 |
| Maurice MacBrien, bishop of Emly, and the confiscation of his baggage, March 1578 | Millett, Benignus | Article in Journal | | 1993 |
| Me jewel and darlin' Dublin | MacThomáis, ÉamonnO'Brien, Michael | Monograph or Collective Volume | O'Brien Press | 1994 |
| Mean Streets: Limerick's gangland | Duggan, Barry | Monograph or Collective Volume | The O'Brien Press | 2012 |
| Measgra i gcuimhne Mhichíl Uí Chléirigh. Miscellany of historical and linguistic studies in honour of Brother Michael Ó Cléirigh, chief of the Four Masters, 1643-1943 | | Monograph or Collective Volume | Assisi Press | 1944 |
| Media and the Irish diaspora from the twentieth century to the present | O'Brien, Mark | Article in Book | | 2024 |
| Mediaeval Dublin: Two historic walks | Broad, IanRosney, Bride | Monograph or Collective Volume | The O'Brien Press | 1982 |
| Medieval Dublin : two historic walks | Broad, IanRosney, Bride | Monograph or Collective Volume | O'Brien Press | 1982 |
| Medieval funerary effigies in Gaelic Ireland : exploring some thirteenth-century French pathways | O'Loghlen, Edward | Article in Book | | 2013 |
| Medieval Kilmeaden parish clergy: rectors or vicars? | O'Brien, Niall C.E.J. | Article in Journal | | 2019 |
| Medieval Youghal : the development of an Irish seaport trading town, c.1200-c.1500 | O'Brien, A. F. | Article in Journal | | 1989 |
| Megalithic tombs, metal resources and territory in prehistoric south-west Ireland | O'Brien, William | Article in Book | | 2000 |
| Mellifont Abbey, Co. Louth: a study of its post-dissolution architecture 1540-1727 | Loeber, RolfO'Brien, KevinStout, Geraldine | Article in Journal | | 2016 |
| Memoir : my life and times | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | Poolbeg | 1998 |
| Memoirs : my life and themes | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | Poolbeg | 1999 |
| Memoirs of an autobiographer | O'Brien, George, 1945- | Article in Book | | 2007 |
| Memorial in favour of William Smith O’Brien, Kingstown, 1848 | Anonymous | Article in Journal | | 1995 |
| Memories : All Saints' Grangegorman : Choir and Vestry | O'Brien, Harold T. | Monograph or Collective Volume | [The author] | 1995 |
| Memories of a school-going era | O'Brien, Tim | Article in Journal | | 2015 |
| Memories of Mary | O'Brien, Seamus | Article in Journal | | 2011 |
| Memories of Upper Bridge St | O'Brien, Seamus | Article in Book | | 2007 |
| Merchants and esquires : special juries in Dublin, 1725-1833 | Howlin, Niamh | Article in Book | | 2008 |
| Merchants in Cork before the famine | O'Brien, John B. | Article in Book | | 1986 |
| Messianism or messianicity? Remembering revolution and the shaping of Irish nationalism | O'Brien, Eugene | Article in Book | | 2011 |
| Michael A. O'Brien (1896-1962) : a bibliography | Baumgarten, Rolf | Article in Journal | | 1987 |
| Michael Collins: Hero and Rebel | Massey, Ethine | Monograph or Collective Volume | O'Brien Press | 20 |
| Michael Cusack and the rise of the G.A.A. | Greene, David | Article in Book | | 1960 |
| Michael J. O'Brien, Irish-American historian | Rodechko, James P. | Article in Journal | | 1970 |
| Michael John Collins and Marianne O'Brien | Dowd, Mary T.Huethorst, Bernard | Article in Journal | | 2007 |
| Michael Mallin | Hughes, Brian | Monograph or Collective Volume | O'Brien | 2012 |
| Michael Ó Conlain 1927-2015. Obituary | O'Brien, Seamus | Article in Journal | | 2017 |
| Mícheál Ó Cléirigh, his associates and St Anthony's College, Louvain | Jennings, BrendanMooney, CaniceO'Brien, FelimWalsh, Paul, Revd, 1885-1941 | Monograph or Collective Volume | Four Courts | 2008 |
| Microliths, megaliths, beakers and bronze - the prehistoric archaeology of county Londonderry, 7000-400 BC | Neill, Kenneth | Article in Book | | 1999 |
| Midwifery | Ross, Ian Campbell | Article in Book | | 1986 |
| Miscellanea Hibernica | O'Brien, M. A. (Michael Alphonsus) | Article in Journal | | 1938 |
| Mobility and mayors : merchant utilization of the position of lord mayor, 1760-1800 | Griffith, Lisa-Marie | Article in Book | | 2008 |
| Modern Irish trade and industry | O'Brien, George, 1892-1973Riordan, E. J., | Monograph or Collective Volume | Methuen | 1920 |
| Modern Mullingar, 1923-1993 | Illingworth, Ruth | Article in Book | Geography Publications | 2022 |
| Modernity and Anti-Modernism | Pierce, Andrew | Article in Book | Oxford University Press | 2003 |
| Montréal and Buffalo : famine memory in metamorphosis | O'Brien, Kathleen | Article in Journal | | 2004 |
| Mór a-tá ar theagasg flatha: speculum principis le Tadhg mac Dáire Mheic Bhruaideadha | Nic Cárthaigh, Emma | Article in Book | | 2013 |
| Moran of the 'Leader' and Ryan of the 'Irish Peasant' | Inglis, Brian | Article in Book | | 1960 |
| More pages from an Irish memoir | Lynch, Patrick, 1917-2001 | Article in Book | | 1998 |
| Mother Agatha O’Brien (1822-1854). The story of a remarkable Carlow nun | O'Neill, Seán | Article in Journal | | 1995 |
| Mother from hell: two brothers, a sadistic mother, a childhood destroyed | Doyle, Ken,Doyle, Patrick,Pierce, Nicola | Monograph or Collective Volume | O'Brien Press | 2009 |
| Mount Gabriel : Bronze Age mining in Ireland | Brindley, AnnaChambert, FrankIxer, Robert A.Lanting, JanMcKeown, SandraMighall, TimO'Brien, William | Monograph or Collective Volume | Galway University Press | 1994 |
| Mount Ievers, or Ballyarilla Castle | Breen, MartinUa Cróinín, Risteárd | Article in Journal | | 2017 |
| Mountcashel tower house and its colourful inhabitants throughout history | O'Brien, John | Article in Journal | | 1978 |
| Mourning the martyrs : a study of a demonstration in Limerick city, 8/12/1867 | Mac Giolla Choille, Breandán | Article in Journal | | 1987 |
| Mr Hodgins and his hollies ... the story of a famous Wicklow nurseryman | O'Brien, Seamus | Article in Journal | | 2011 |
| Mrs John O'Brien, her life, her work, her friends | Bayley Butler, BeatriceButler, Katherine | Article in Journal | | 1980 |
| Muintir Ghadhra | Bairead, F. | Article in Book | | 1944 |
| Mullingar in mid-century : famine, execution and an attempted rising by the people | O'Brien, Seamus | Article in Book | | 2002 |
| Munster at war | O'Brien, B. | Monograph or Collective Volume | Mercier Press | 1971 |
| Munster hurling legends : seven decades of the greatest teams, players and games | Sweeney, Eamon | Monograph or Collective Volume | O'Brien Press | 2003 |
| Murchertach O'Brien, high king of Ireland, and his Norman son-in-law, Arnulf de Montgomery, circa 1100 | Curtis, Edmund, 1881-1943 | Article in Journal | | 1921 |
| Murder mystery at Dundrum Castle, Co. Dublin | O'Brien, Elizabeth | Article in Book | | 2009 |
| Murrough O'Brien, sixth baron and first earl of Inchiquin | Murphy, John A. | Thesis | | 1951 |
| Murrough the burner : Murchadh na dTóiteán : a life of Murrough, sixth baron and first earl of Inchiquin, 1614-74 | O'Brien, Ivor | Monograph or Collective Volume | Ballinakella | 1991 |
| Music | Boydell, Brian | Article in Book | O'Brien Press | 1986 |
| Music as Theology | Zon, Bennett | Article in Book | Oxford University Press | 2023 |
| My earliest Irish friends | O'Brien, Mrs William (O'Brien, Sophie Raffalovich, 1860-1960) | Article in Journal | | 1949 |
| My scholarly and sagacious friend | Flanagan, Thomas | Article in Book | | 1998 |
| Myles na gCopaleen and the fate of “devocracy” : Cruiskeen Lawn and Irish electoral politics in the late 1950s | Peral, Germán Asensio | Article in Journal | | 2022 |
| Myself and "the Cruiser" | Murphy, John A. | Article in Book | | 1998 |
| Nano Nagle - an unconventional woman | Castle, JessieO'Brien, Gillian | Article in Journal | | 2018 |
| Nationalist historiography and the decline of the Irish economy : George O'Brien revisited | Johnson, D. S.Kennedy, Liam, 1946- | Article in Book | | 1991 |
| Nationalist in the broadest sense: the 'Irish Independent' and the Irish revolution | Kenneally, Ian | Article in Book | | 2012 |
| Nationalist politics in Derry 1945-1969 | Lynn, Brendan | Article in Book | | 1999 |
| Negotiations of Irish identity in the wake of terrorism : the case of the Irish in Birmingham 1973–74 | O'Brien, Sarah | Article in Journal | | 2017 |
| Negotiations of Irish identity in the wake of terrorism : the case of the Irish in Birmingham 1973–74 | O'Brien, Sarah | Article in Journal | | 2017 |
| Neighbours | O'Brien, Conor Cruise, 1917-2008Pakenham, Thomas | Monograph or Collective Volume | Faber | 1980 |
| Neilí O'Brien and the Gaelic League | Murphy, Maureen | Article in Book | | 2019 |
| Nevill Johnson : paint the smell of grass | Hall, Dickon,O'Brien, Eoin | Monograph or Collective Volume | Ava Gallery | 2008 |
| New archaeological finds at Killea graveyard | O'Brien, Richard | Article in Journal | | 2000 |
| New documents on the disputed kinship among the Jacobite O'Briens in eighteenth-century France | Corp, Edward
| Article in Journal | | 2022 |
| New finds from Co. Offaly | O'Brien, Caimin | Article in Journal | | 1994 |
| New light on Irish emigration | O'Brien, George, 1892-1973 | Article in Journal | | 1941 |
| New Theatre Group plays | Klaus, H. Gustav | Article in Book | | 1994 |
| New wines in old skins : new Polish and Irish immigrants and Polish - Irish - American ethnics | O'Brien, Matthew J., 1968- | Article in Book | | 2003 |
| Newcastle fort 1566-1606 | O'Brien, Andrew | Article in Journal | | 2000 |
| Nine Ulster lives | | Monograph or Collective Volume | Ulster Historical Foundation | 1992 |
| No 'help to the imagination': Kate O'Brien and the Emergency | Teekell, Anna | Article in Journal | | 2018 |
| No laughing matter : the life and times of Flann O'Brien | Cronin, Anthony | Monograph or Collective Volume | New Island | 2003 |
| No longer a political side show : T.R. Harrington and the 'new' Irish Independent, 1905-31 | Larkin, Felix M. | Article in Book | | 2012 |
| No ordinary women : Irish female activists in the revolutionary years, 1900-1923 | McCoole, Sinead | Monograph or Collective Volume | O'Brien Press | 2003 |
| No profit but the name : the Longfords and the Gate theatre | Cowell, John, 1912- | Monograph or Collective Volume | O'Brien Press | 1988 |
| Nora Connolly-O'Brien | Ó Catháin, Máirtín | Article in Book | | 2016 |
| Nora O’Brien talks to Paul McNamara | McNamara, Paul | Article in Journal | | 1996 |
| North Quay connections | O'Brien, Andrew | Article in Journal | | 2001 |
| Notaí ar an aisling fháithchiallaigh | De Bhaldraithe, Tomás | Article in Book | | 1944 |
| Notes. The Thomond Tomb of St Mary's Cathedral reconsidered | Harris, Amy LouiseÓ Dáleigh, Brian | Article in Journal | | 2017 |
| Notes.Conor Francis O'Brien's postcard from the front May 1916 | Reilly, Conor | Article in Journal | | 2008 |
| Nothing to declare : the drug smuggler's deadly trade | Murphy, Ann | Monograph or Collective Volume | O'Brien | 2008 |
| O' Brien pocket history of the IRA : from 1916 onwards | O'Brien, Brendan | Monograph or Collective Volume | O'Brien Press | 2007 |
| O'Brien : people and places | Weir, Hugh W. L. | Monograph or Collective Volume | Ballina Press | 2002 |
| O'Brien and MacNamara rentals relating to certain lands in Thomond in the mid-fourteenth century | MacMahon, Michael | Article in Journal | | 2005 |
| O'Brien Butler : composer of the Gaelic Revival | Butler, Aidan | Article in Journal | | 2012 |
| O'Brien of Thomond : the O'Briens in Irish history 1500-1865 | O'Brien, Ivar | Monograph or Collective Volume | Phillimore | 1986 |
| O'Brien people and places | Weir, Hugh W. L. | Monograph or Collective Volume | Ballinakella | 1983 |
| O'Brien pocket history of Gaelic sports | Sweeney, Eamon | Monograph or Collective Volume | O'Brien Press | 2004 |
| O'Brien pocket history of Irish writers : from Swift to Heaney | Jeffares, A. Norman | Monograph or Collective Volume | O'Brien Press | 2005 |
| O'Brien pocket history of the Famine | O'Donnell, Ruán | Monograph or Collective Volume | O'Brien Press | 2008 |
| O'Brien pocket history of the troubles | Feeney, Brian | Monograph or Collective Volume | O'Brien Press | 2004 |
| O'Brien pocket history of the Troubles | Feeney, Brian | Monograph or Collective Volume | O'Brien Press | 2007 |
| O'Brien's Baltinglass origins | Gorry, Paul | Article in Book | | 2006 |
| O'Brien's Bridge in the reign of Henry VIII | Hodkinson, Brian | Article in Journal | | 1998 |
| O'Brien's Bridge in the reign of Henry VIII | Hodkinson, Brian J. | Article in Book | | 2012 |
| O'Brien, John Alysius (1878-1956) | Ronald, Heather | Article in Journal | | 1998 |
| O'Briens best drinks | O'Brien, Gerard | Article in Journal | | 2004 |
| O'Bryne genealogical charts | Nicholls, K. W. (Kenneth W.) | Article in Book | | 1998 |
| O'Clery's glossary and its forerunners | Knott, Eleanor | Article in Book | | 1944 |
| O'Clerys in west Mayo | Ó Moghráin, Pádraig | Article in Book | NA | 1944 |
| O'Connell and the Ireland in which he lived | O'Brien, G. A. T. | Article in Journal | | 1929 |
| O'Connell and the Ireland in which he lived | O'Brien, George, 1892-1973 | Article in Journal | | 1929 |
| O'Connell's liberal rivals in 1843 | Sloan, Robert | Article in Journal | | 1996 |
| O'Connell, O'Connor and O'Brien angles of vision, 1832-48 | McCormack, Caitriona Marie | Thesis | | 1996 |
| Obituaries Fredrick J. (Freddie) Shekleton 1940-2016 | O'Brien, Michael | Article in Journal | | 2016 |
| Obituaries. Jerome Dufficy 1946-2012 | Clinch, PaulO'Brien, Dermot | Article in Journal | | 2013 |
| Obituaries. Simon Quinn 1921-2011 | O'Brien, Dermot | Article in Journal | | 2011 |
| Obituary : John B. O'Brien (d. 1999) | Anonymous | Article in Journal | | 2000 |
| Obituary notices in the Providence, Rhode Island, newspapers | O'Brien, Michael J. | Article in Journal | | 1926 |
| Obituary. Robert Donough O'Brien | P., R. Ll. | Article in Journal | | 1917 |
| Observations on the text known as the Leabhar Oiris | Ní Úrdail, Meidhbhín | Article in Book | | 2013 |
| Old Athlone | Murtagh, Harman | Article in Book | | 1991 |
| Old days : old ways : [an illustrated folk history of Ireland] | Sharkey, Olive | Monograph or Collective Volume | O'Brien Press | 1985 |
| Old Irish personal names | O'Brien, M. A. (Michael Alphonsus) | Article in Journal | | 1973 |
| Oliver Cromwell in Ireland | Butler, William, Sir | Article in Book | | 1903 |
| On some ancient remains at Kilmaclenine, with illustrations from the Pipa Colmani | Olden, Thomas | Article in Journal | | 1879 |
| On the banks of the Dodder : Rathgar & Churchtown: An illustrated history | Walsh, Ged | Monograph or Collective Volume | The O'Brien Press | 2019 |
| On the road : from Tara to Tiananmen Square | Healy, Shay, 1943- | Monograph or Collective Volume | O'Brien Press | 2005 |
| Once upon a springtime, when the visitor was the student Prince of Wales | O'Brien, Gerald | Article in Journal | | 2005 |
| One thousand years of Irish whiskey | Magee, Malachy | Monograph or Collective Volume | O'Brien Press | 1980 |
| Opportunities for economic expansion : Ireland and the European Union | Reidy, Theresa | Article in Book | | 2015 |
| Orange and green, 1912-62 | Jeffery, Keith | Article in Book | | 1985 |
| Ordinary people dancing : essays on Kate O'Brien | Walshe, Eibhear | Monograph or Collective Volume | [s.n.] | 1993 |
| Origins of Saint Patrick's Cathedral, Skibbereen | O'Brien, GeraldO'Regan, Philip | Article in Journal | | 2018 |
| Other voices : The Bell and documentary journalism | O'Brien, Mark | Article in Book | | 2014 |
| Our lives out loud : in pursuit of justice and equality | Gilligan, Ann Louise, Katherine | Monograph or Collective Volume | O'Brien Press | 2008 |
| Our man in the Vatican | O'Brien, Martin | Article in Journal | | 2011 |
| Our mining past : the metal-mining heritage of Cork | O'Brien, William | Monograph or Collective Volume | Cork Public Museum | 1994 |
| Our parish, its church and its patrons | O'Brien, D. | Article in Journal | | 1983 |
| Our Tipperary-born martyrs | Ahern, Michael | Article in Book | | 1993 |
| Overseas Missions | Carey, Hilary M. | Article in Book | Oxford University Press | 2003 |
| Owen Roe O'Neill (1582-1649) | O'Brien, B. | Article in Journal | | 1971 |
| Owen Roe O'Neill, c.1582-1649 : soldier and politician | Gillespie, Raymond | Article in Book | | 1992 |
| Paddy Reilly : from the fields of Athenry to the Dubliners and beyond | Reilly, Paddy | Monograph or Collective Volume | O'Brien Press | 2022 |
| Pagan and Christian burial in Ireland during the first millennium AD : continuity and change | O'Brien, Elizabeth | Article in Book | | 1992 |
| Pagan or Christian? Burial in Ireland during the 5th to 8th centuries | O'Brien, Elizabeth | Article in Book | | 2009 |
| Painting the past - a reconstruction of the Timber Castle of Lorrha | O'Brien, Caimin | Article in Journal | | 2023 |
| Palette and plough : a pen-and-ink drawing of Dermod O'Brien | Robinson, Lennox | Monograph or Collective Volume | Richview Press | 1948 |
| Parish by parish: constructing Chicago as Catholic space | Skerrett, Ellen | Article in Book | | 2012 |
| Parliament, politics and people : essays in eighteenth-century Irish history | | Monograph or Collective Volume | Irish Academic Press | 1989 |
| Parnell and his Party, 1880-90 | O'Brien, C. C. | Monograph or Collective Volume | Clarendon Press | 1957 |
| Parnell and William O'Brien : partners and friends - from consensus to conflict in the land war | Warwick-Haller, Sally | Article in Book | | 1991 |
| Parnell's monument | O'Brien, Conor Cruise, 1917-2008 | Article in Journal | | 1945 |
| Parnellite politics and the origins of Independent Newspapers | Maume, Patrick | Article in Book | | 2012 |
| Parnellites and anti-Parnellites in Kilkenny City | Patterson, Tony | Article in Journal | | 2017 |
| Parties and power | Viney, Michael | Article in Book | | 1969 |
| Passing the time : folklore and history of an Ulster community | Glassie, Henry | Monograph or Collective Volume | O'Brien Press | 1982 |
| Passion and cunning : an essay on the politics of W. B. Yeats | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1965 |
| Pat Redmond (1951-2007) | O'Brien, Paddy | Article in Journal | | 2007 |
| Pat Redmond (1951-2007) | O'Brien, Paddy | Article in Journal | | 2007 |
| Patrick Hogan, minister for agriculture, 1922-32 | O'Brien, George, 1892-1973 | Article in Journal | | 1936 |
| Patrick Hogan, schoolmaster and revolutionary soldier | O'Brien, Michael J. | Article in Journal | | 1922 |
| Patrick McCann, hero of the border | O'Brien, Michael J. | Article in Journal | | 1922 |
| Patrick Pearse in King's Bench | Kenny, Colum | Article in Journal | | 2016 |
| Peadar O'Donnell : Irish social rebel | McInerney, Michael | Monograph or Collective Volume | O'Brien Press | 1974 |
| People, politics and power : from O'Connell to Ahern | Collins, Stephen | Monograph or Collective Volume | O'Brien Press | 2007 |
| Periodicals and journalism in twentieth-century Ireland 2: a variety of voices | NA | Monograph or Collective Volume | Four Courts Press | 2021 |
| Periodicals and journalism in twentieth-century Ireland : Writing against the grain | | Monograph or Collective Volume | Four Courts | 2014 |
| Perrot's poison plot | Morgan, Hiram | Article in Journal | | 1998 |
| Peter Pearson's decorative Dublin | Broad, IanDavison, DavidPearson, PeterPearson, PeterVance, Robert | Monograph or Collective Volume | O'Brien | 2002 |
| Petticoat pilots : biographies and achievements of Irish female aviators, 1909-1939. Volume one. | Traynor, Michael | Monograph or Collective Volume | Michael Traynor | 2019 |
| Phelim MacFeagh's revolt, 1597-1599 | O'Brien, Andrew | Article in Journal | | 1998 |
| Philosophy of Irish people | O'Brien, Thomas V. | Article in Journal | | 1911 |
| Phrases make history here : a century of Irish political quotations, 1886-1996 | O'Clery, Conor | Monograph or Collective Volume | O'Brien Press | 1986 |
| Pioneer Irish families in Virginia, the Meades and Sullivans | O'Brien, Michael J. | Article in Journal | | 1926 |
| Pioneer Irish in New England | O'Brien, Michael | Monograph or Collective Volume | P. J. Kennedy | 1937 |
| Plant hunting and its influence on the Irish country house | O'Brien, Seamus | Article in Book | | 2022 |
| Playing 'Irish' sport on baseball's hallowed ground : the 1947 All Ireland Gaelic Football final | Brady, Sara | Article in Book | | 2009 |
| Policing the press : censorship, family planning, and the press in Ireland, 1929–67 | O'Brien, Mark | Article in Journal | | 2021 |
| Policing the press: censorship, family planning, and the press in Ireland, 1929–67 | O'Brien, Mark | Article in Journal | | 2021 |
| Political censorship and the democratic state : the Irish broadcasting ban | | Monograph or Collective Volume | Four Courts | 2005 |
| Political thought in early Irish exegesis | O'Brien, Conor | Article in Journal | | 2021 |
| Politicians and other animals | O'Leary, Olivia | Monograph or Collective Volume | O'Brien Press | 2004 |
| Politics, community and nationhood in Irish-Argentine oral narrative, 2010-2012 | O'Brien, Sarah | Article in Book | | 2014 |
| Politics, economy and society : the development of Cork and the Irish south-coast region, c.1170-c.1583 | O'Brien, A. F. | Article in Book | | 1993 |
| Poor Clares, Galway, 1642-1992 | O'Brien, Celsus | Monograph or Collective Volume | Poor Clares | 1992 |
| Population, politics and society in Cork, 1780-1900 | O'Brien, John B. | Article in Book | | 1993 |
| Population, Society and Politics in Cork from the Late-Eighteenth Century to 1900 | O'Brien, John B. | Article in Book | | 2002 |
| Portrait of Charles O'Brien, Sixth Viscount Clare | Ó Murchadha, Ciarán | Article in Journal | | 2018 |
| Portrait of the city : framing the significance of urban landscapes | O'Brien, Gillian,O'Kane, Finola | Article in Book | | 2012 |
| Portraits in leadership | O'Brien, B. | Monograph or Collective Volume | Eigse na Mainistreach | 1980 |
| Portraits of the city: Dublin and the wider world | O'Brien, Gillian,O'Kane, Finola | Monograph or Collective Volume | Four Courts Press | 2012 |
| Possible evidence of textile-processing from a burnt stone mound at Coonagh West, Co. Limerick | Brown, TonyDavis, SteveO'Brien, CharlotteO'Donnell, LornaReilly, Fiona | Article in Journal | | 2012 |
| Post Office workers flex their muscle | O'Brien, Paul | Article in Book | | 2017 |
| Post-1755 Lisbon : two-and-a-half portraits | Cunha Leal, Joana | Article in Book | | 2013 |
| Post-Ceasefire Antigones and Northern Ireland | Torrance, Isabelle | Article in Book | NA | 2020 |
| Post-Famine Athlone | O'Brien, Gearoid | Article in Book | Geography Publications | 2022 |
| Post-medieval glassware | Roches, Nessa | Article in Book | | 2004 |
| Pottery of the high medieval period | McCutcheon, Clare | Article in Book | | 2004 |
| Pottery of the late medieval and post-medieval periods | Meenan, Roseanne | Article in Book | | 2004 |
| Poverty in Ennis in the second half of the nineteenth century | O'Brien, Jane | Article in Journal | | 2017 |
| Powering the Nation : images of the Shannon Scheme and electricity in Ireland | O'Brien, Sorcha | Monograph or Collective Volume | Irish Academic Press | 2017 |
| Prayer, penance and the Passion of Christ : the iconographic programme of the Franciscan friary at Ennis, Ireland | Krasnodebska-D’Aughton, Malgorzata | Article in Journal | | 2016 |
| Pre-historic and early historic remains | O'Brien, Elizabeth | Article in Book | | 1987 |
| Prehistoric barrows in Westmeath | McGuinness, David | Article in Book | Geography Publications | 2022 |
| Prehistoric Copper Mining in Europe 5500-500 BC | O'Brien, William | Monograph or Collective Volume | Oxford University Press | 2015 |
| Prehistoric copper mining in south-west Ireland : the Mount-Gabriel type mines | O'Brien, William | Article in Journal | | 1990 |
| Present at the creation : John V. Kelleher and the emergence of Irish studies in America | Fanning, Charles | Article in Book | | 2009 |
| Presentation parlour | O'Brien, Kate | Monograph or Collective Volume | Heinemann | 1963 |
| Priests and Parishes | Champ, Judith | Article in Book | Oxford University Press | 2023 |
| Primary education patterns in Whitegate, 1808-1908 | O'Brien, Margaret | Article in Journal | | 1989 |
| Profits, politics and personal position : the role of the proprietor | Rafter, Kevin | Article in Book | | 2012 |
| Projecting the past : historical documentary in Ireland | O'Brien, Harvey | Article in Journal | | 2000 |
| Projecting the past : historical documentary in Ireland | O'Brien, Harvey | Article in Journal | | 2000 |
| Prospects of patrimony: M. F. Trench and F. W. Trench's projects for Dublin and London, 1780-1830 | Daniels, Stephen,O'Kane, Finola | Article in Book | | 2012 |
| Protecting civil liberties, promoting human rights : 30 years of the Irish Council for Civil Liberties (ICCL) | O'Brien, Carl | Monograph or Collective Volume | Irish Council for Civil Liberties | 2006 |
| Protestant provincial survival or Confederate control : Inchiquin and the Battle of Liscarroll 1642 | O'Doherty, Leon | Article in Journal | | 2015 |
| Public Catholicism | O'Brien, David | Monograph or Collective Volume | Macmillan | 1989 |
| Public space for display and promenade in Georgian Dublin | Costello, Vandra | Article in Book | | 2008 |
| Public virtue, public love : the early years of the Dublin lying-in hospital, the Rotunda | | Monograph or Collective Volume | The O'Brien Press | 1986 |
| Questions and answers in the Mandeville deeds | O'Brien, Niall | Article in Journal | | 2010 |
| Quinntessential Feargal : a memoir | Quinn, Feargal | Monograph or Collective Volume | O'Brien Press | 2016 |
| Radical nationalist activities in County Derry 1900-1921 | Augusteijn, Joost | Article in Book | | 1999 |
| Radicalism and reputation : the career of Bronterre O'Brien | Turner, Michael J. | Monograph or Collective Volume | Michigan State University Press | 2017 |
| Rahan parish, County Offaly : the O'Brien-Sherlock estate and the founding of the Presentation Convent | Byrne, Michael | Article in Journal | | 2018 |
| Rambles in Clare, 1911 | Lynd, Robert | Article in Book | | 1998 |
| Rathdrum : a pictorial history | | Monograph or Collective Volume | Rathdrum Historical Society | 2002 |
| Ravenswood by Francis O'brien | O'Brien, Francis | Article in Journal | | 2019 |
| Rear-Admiral Lucius O'Brien, R.N. | O'Brien, Ivor | Article in Journal | | 1993 |
| Rebel Irishwomen | Fox, R. M. | Monograph or Collective Volume | | 1935 |
| Rebel Prods : the forgotten story of Protestant radical nationalists and the 1916 Rising | Jones, Valerie | Monograph or Collective Volume | Ashfield Press | 2016 |
| Rebellion! Ireland in 1798; incorporating a yearbook of 1798 bicentennial commemorative events | Gahan, Daniel J. | Monograph or Collective Volume | O'Brien Press for Comóradh '98 | 1997 |
| Rebellious Jews on the edge of Empire: The Judaeo-Irish Home Rule Association | Miller Rubens, Heather | Article in Book | | 2018 |
| Recollections of an Irish Poor Clare in the seventeenth century : Mother Mary Bonaventure, third abbess of Galway, 1647-1650 | Browne, Mary BonaventureO'Brien, Celsus | Monograph or Collective Volume | Poor Clares | 1993 |
| Recollections of Sophie O'Brien - Croagh Patrick 1904 | Clarke, Aidan | Article in Journal | | 2006 |
| Recollections of the Famine | O'Brien, Pat | Article in Journal | | 2005 |
| Records of burials at Christ Church, Philadelphia | O'Brien, Michael J. | Article in Journal | | 1914 |
| Recreation, games and pastimes in Streamstown over the century | Murray, Patsy | Article in Book | | 2002 |
| Red Hugh O'Donnell the soldier | O'Brien, B. | Article in Journal | | 1971 |
| Rediscovering Columba's monastery at Durrow, Co. Offaly | O'Brien, Elizabeth | Article in Book | | 2012 |
| Regency rogue : Dan Donnelly, his life and legends | Myler, Patrick | Monograph or Collective Volume | O'Brien Press | 1976 |
| Religion and politics : the Parnellite split in Westmeath | Nolan, Michael | Article in Book | Geography Publications | 2022 |
| Religious residential segregation in urban County Derry 1831-1991 : a study of variation in space and time | Poole, Michael A. | Article in Book | | 1999 |
| Remembering Cornelius O'Brien, M.P. | M., J. | Article in Journal | | 2018 |
| Report from the Select Committee on local government and taxation of towns (Ireland) [Chairman : Sir Michael Hicks Beach], plus two Further Reports; three Reports of commissioners to examine localities; and Special report by William P. O'Brien | Anonymous | Monograph or Collective Volume | | 1878 |
| Rereading the Rising : towards an understanding of the influence of “Easter 1916” on contemporary Ireland | O'Brien, Eugene | Article in Journal | | 2022 |
| Rereading the rising : towards an understanding of the influence of “Easter 1916” on contemporary Ireland | O'Brien, Eugene | Article in Journal | | 2022 |
| Rethinking Irish protectionism: Jewish refugee factories and the pursuit of an Irish Ireland for industry | Kessler , Trisha Oakley | Article in Book | | 2018 |
| Rev. Professor T. A. Finlay, S. J. | O'Brien, George, 1892-1973 | Article in Journal | | 1940 |
| Review article : Public intellectuals: John A., Conor and the lads in the back | Akenson, Donald Harman | Article in Journal | | 2007 |
| Review article : the historian as writer or critic? Conor Cruise O’Brien and his biographers | McCormack, W. J. | Article in Journal | | 1996 |
| Review article. Bronze age studies in Europe today | Jones, Carleton | Article in Journal | | 2014 |
| Review article. Flann O'Brien, Myles na gCopaleen and Irish cultural debate | Ó Conaire, Breandán | Article in Journal | | 2009 |
| Revolution and the shaping of modern Ireland | Montagne, John | Article in Book | | 1982 |
| Revolution and the shaping of modern Ireland | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1982 |
| Revolution, rebellion and the viceroyalty, 1789-99 | O'Brien, Gillian | Article in Book | | 2012 |
| Revolutionary imperialist : William Smith O'Brien, 1803-1864 | Davis, Richard | Monograph or Collective Volume | Lilliput | 1998 |
| Revolutionary woman, 1878-1972 | Clarke, Kathleen, 1878-1972Litton, Helen | Monograph or Collective Volume | O'Brien | 1991 |
| Rewriting genre in The Country Girls Trilogy | Chase, Elizabeth A. | Article in Journal | | 2010 |
| Richard Baptist O'Brien, dean of Limerick (1809-1885) | Manley, Edward Joseph | Thesis | | 1991 |
| Richard Poekrich (1695-1759) | Fleetwood, John | Article in Book | | 1978 |
| Robert Peel and the pursuit of Catholic emancipation, 1813-1817 | O'Brien, Gerard | Article in Journal | | 1988 |
| Robots of the past : Fitz-James O'Brien "The Wondersmith" | Hoppenstand, G. | Article in Journal | | 1994 |
| Ross Island - the beginning | O'Brien, William | Article in Journal | | 1995 |
| Ross Island : mining metal and society in early Ireland | O'Brien, William | Monograph or Collective Volume | National University of Ireland | 2004 |
| Round towers of Ireland | Corlett, Christiaan | Monograph or Collective Volume | O'Brien Press | 2025 |
| Roundwood at the start of World War II | O'Brien, Patrick | Article in Journal | | 1996 |
| Royal constables of Cashel Castle, Co. Tipperary | O'Brien, Niall C.E.J. | Article in Journal | | 2013 |
| Royal Hospital Kilmainham | O'Brien, Paul | Monograph or Collective Volume | Kilmainham Tales | 2014 |
| Royal supplications of the Swedish Boards of Trade and Mines on behalf of Dennis O'Brien (1723-26) and John O'Kelly (1725-28) | Grosjean, AlexiaMurdoch, Steve | Article in Journal | | 2006 |
| Rudimenta Grammaticae Hibernicae | Mac Aodhagáin, Parthalán | Article in Book | | 1944 |
| Rural housing in Ireland : a description and classification for the 1980s | O'Brien, Lancelot | Article in Journal | | 1989 |
| Sacred ground : megalithic tombs in coastal south-west Ireland | O'Brien, William | Monograph or Collective Volume | National University of Ireland | 1999 |
| Sadleir's bank (the Tipperary joint stock bank 1838-56) | O'Brien, John B. | Article in Journal | | 1977 |
| Saint Patrick: Life, Legend and Legacy | Broderick, Marian | Monograph or Collective Volume | The O'Brien Press | 2019 |
| Saltees | Merne, OscarRoche, Richard | Monograph or Collective Volume | O'Brien Press | 1977 |
| Saltees : islands of birds and legends | Roche, Richard | Monograph or Collective Volume | O'Brien Press | 1977 |
| Samuel Phayer-Harris, Protestant Nationalist and land campaigner | Phayer, John A. | Article in Journal | | 2019 |
| Sarsfield | Gwynn, Stephen Lucius, 1864-1950 | Article in Book | | 1903 |
| Schemes credible and incredible | O'Brien, Michael | Article in Book | | 1996 |
| School attendance and literacy in Ireland before the Great Famine : a simple baronial analysis | Ó Gráda, Cormac | Article in Book | | 2013 |
| Schools and teachers in Kilbarron and Terryglass parishes from circa 1800 to the present day | O'Brien, Brigid | Article in Journal | | 1990 |
| Scotland, Ireland, and the antithesis of Enlightenment | O'Brien, Gerard | Article in Book | | 1995 |
| Scottish, Irish, and imperial connections : Parliament, the three kingdoms, and the mechanization of cotton spinning in eighteenth-century Britain | Griffiths, TrevorHunt, PhilipO'Brien, Patrick Karl, 1932- | Article in Journal | | 2008 |
| Screening Irish-America | | Monograph or Collective Volume | Irish Academic Press | 2009 |
| Seamus Heaney and the poetry of origins | Donnelly, Brian | Article in Book | | 1999 |
| Seán Boylan : the will to win : the autobiography as told to John Quinn | Boylan, SeánQuinn, John | Monograph or Collective Volume | O'Brien Press | 2006 |
| Sean O’Casey and the Irish Civil War | O'Brien, Paul | Article in Book | Cork University Press | 2024 |
| Sectarian conflict 1972-77 | Aughey, Arthur | Article in Book | | 1985 |
| Section 31 : ministerial orders and court challenges | White, Alex | Article in Book | | 2005 |
| Seduced by sociability, cards and port wine : the misspent youth of William Smith O'Brien | Davis, Richard | Article in Journal | | 2013 |
| See Rome and die : the burial-place of Donnchad Mac Briain | Duffy, Séan | Article in Journal | | 2014 |
| Seeking conciliation : William O'Brien and the Ulster crisis, 1911-14 | Warwick-Haller, Sally | Article in Book | | 2006 |
| Selected megalithic field monuments in east Waterford | O'Brien, Seán | Article in Book | | 2005 |
| Sentimental journey | Healy, Willie | Article in Journal | | 2005 |
| Sergeant Patrick Cavanaugh, a brave soldier of the revolution | O'Brien, Michael J. | Article in Journal | | 1922 |
| Settlement and social life in Feagh McHugh O'Byrne's Ballinacor | Long, Harry | Article in Journal | | 1998 |
| Seven Irish documents from the Inchiquin archives | | Article in Journal | | 1970 |
| Shadows : an album of the Irish people, 1841-1914 | O'Connell, Michael | Monograph or Collective Volume | O'Brien Press and RTE | 1985 |
| Shamrocks and segregation : the persistence of upper class Irish ethnicity in Beverly Hills, Chicago | Lee, Margaret | Article in Book | | 2009 |
| Shaping the city, shaping the subject: honour, affect and agency in John Gwynn's London and Westminster improved (1766) | Dodsworth, F. M. | Article in Book | | 2012 |
| Sharman Crawford on the repeal question, 1847 | Kennedy, B. A. | Article in Journal | | 1949 |
| Shawlies, Echo boys, the marsh & the lanes : old Cork remembered | Verdon, Michael | Monograph or Collective Volume | O'Brien Press | 1994 |
| Shelley and Catherine Nugent : spirits of the age | O'Brien, Paul | Article in Journal | | 2005 |
| Shelley and revolutionary Ireland | O'Brien, Paul | Monograph or Collective Volume | Redwords | 2002 |
| Shells and Shamrocks: The National Shell Factory at Bilberry, 1917-1919 | O'Brien, Paul | Article in Journal | | 2018 |
| Shipping statistics of the Philadelphia Custom House, 1733 to 1774, refute the Scotch-Irish theory | O'Brien, Michael J. | Article in Journal | | 1923 |
| Shipping statistics of the Philadelphia custom house, 1733 to 1774, refute the Scotch-Irish theory. | O'Brien, Michael Joseph | Article in Journal | | 1923 |
| Shootout : the battle for St Stephen's Green, 1916 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2013 |
| Sinn Féin : a hundred turbulent years | Feeney, Brian | Monograph or Collective Volume | O'Brien | 2002 |
| Sinn Féin and the SDLP : from alienation to participation | Murray, Gerard | Monograph or Collective Volume | O'Brien Press | 2005 |
| Sinn Féin and the SDLP : from alienation to participation | Murray, GerardTonge, Jonathan | Monograph or Collective Volume | O'Brien Press | 2005 |
| Sir Barnaby O'Brien's Irish revenues for 1629-31, Thomond rent, 1629, and Carlow tenants 1639; presented by Brian Mac Cuarta | Mac Cuarta, Brian | Article in Journal | | 2017 |
| Sir Dominic Corrigan (1802-80) : doctor and parliamentarian | O'Brien, Eoin | Article in Journal | | 1984 |
| Sir Edward O'Brien 2nd baronet of Dromoland | O'Brien, Grania R. | Article in Journal | | 2004 |
| Sir Lucius O'Brien, third baronet, 1731-1795 : quintessential patriot or government man? | O'Mahoney, Denva | Thesis | | 2002 |
| Sisters : nine families of sisters who made a difference | | Monograph or Collective Volume | Royal Irish Academy | 2022 |
| Skellig : island outpost of Europe | Lavelle, Des | Monograph or Collective Volume | O'Brien Press | 1976 |
| Sligo's de Burgo castle of 1310 : an addendum | O'Brien, Patrick E.Timoney, Martin A. | Article in Book | | 2002 |
| Sligo, land of Yeats' desire : its history, literature, folklore and landscapes | Cowell, John, 1912- | Monograph or Collective Volume | O'Brien Press | 1989 |
| Sliocht as Beathaisnéis : an Piarsach óg agus Conradh na Gaeilge | O'Brien, Frank | Article in Journal | | 1969 |
| Smith O'Brien and the 'secession' | Gwynn, D. R. (Denis Rolleston), 1893-1972 | Article in Journal | | 1947 |
| Smith O'Brien and Young Ireland | Gwynn, D. R. (Denis Rolleston), 1893-1972 | Article in Journal | | 1947 |
| Smith O'Brien's retribution | Ó Cathaoir, Brendan | Article in Journal | | 1985 |
| Society of St. Vincent de Paul : conference of St. Columba 1903-2003 | Gilmartin, BrianO'Brien, B. | Monograph or Collective Volume | Society of St. Vincent de Paul | 2003 |
| Society slander case - Alexis Roche v Sir T. O'Brien | Crowley, Seamus | Article in Journal | | 2001 |
| Some 17th/18th century residents of Belvedere House, Drumcondra | O'Brien, Andrew | Article in Journal | | 2005 |
| Some aspects of municipal government in Athlone | O'Brien, Brendan | Article in Book | | 1991 |
| Some aspects of vernacular culture and oral history in Co. Westmeath: Jim Delaney and his work with Patsy Johnson | Ní Fhloinn, Bairbre | Article in Book | Geography Publications | 2022 |
| Some aspects of William Smith O'Brien's parliamentary career : his links with the Royal Dublin Society | Heaney, Carmel | Article in Book | | 2009 |
| Some commercial and other sources for the Edward Worth Library (1733) | McCormack, W. J. | Article in Book | | 2008 |
| Some early Murphys in North Carolina | O'Brien, M. J. | Article in Journal | | 1911 |
| Some examples of the "Scotch-Irish" in America | O'Brien, Michael J | Article in Journal | | 1915 |
| Some interesting notes on Washington, D. C. | O'Brien, Michael J. | Article in Journal | | 1914 |
| Some interesting shipping statistics of the eighteenth century | O'Brien, Michael J. | Article in Journal | | 1914 |
| Some Irish names culled from the official records of New Hampshire | O'Brien, Michael J. | Article in Journal | | 1919 |
| Some literary remains of Attie O'Brien of Kildysart | Fairbairn, Margaret | Article in Journal | | 1944 |
| Some matters touching Dromoland : letters of father and son, 1758-9 | McNamara, Leo | Article in Journal | | 1986 |
| Some members of the Confederation of Kilkenny | Cregan, Donal F. | Article in Book | | 1944 |
| Some observations on the 'Dublin Annals of Inisfallen' | Ní Úrdail, Meidhbhín | Article in Journal | | 2007 |
| Some stray tidbits of the American revolution | O'Brien, Michael J. | Article in Journal | | 1918 |
| Some Thomond 'Escapees' - the survival of a volume of Thomond Manuscripts, recently located and returned to Ireland from the USA [with index] | Breen, Martin | Article in Journal | | 2024 |
| Some towerhouses of East Corca Bhaiscinn and the Shannon Estuary [Parts I-II] | Breen, MartinUa Cróinín, Risteárd | Article in Journal | | 2013 |
| Some traces of the Irish settlers in the colony of Massachusetts Bay | O'Brien, M. J. | Article in Journal | | 1919 |
| Some traces of the Irish settlers in the colony of Massachusetts Bay | O'Brien, Michael J. | Article in Journal | | 1919 |
| Some vanishing Country Houses near Mullingar | O'Brien, Donal | Article in Journal | | 2017 |
| Sources for the study of emigration | Mitchell, Brian | Article in Book | | 1999 |
| Spanish correspondence | O'Brien, Thomas | Article in Book | | 1994 |
| Speaking out : The role of documentary | O'Brien, Harvey | Article in Book | | 2012 |
| Spring and the labour story | Collins, Stephen | Monograph or Collective Volume | O'Brien Press | 1993 |
| St Fachtna's Silver Band, Skibbereen | O'Brien, Séamus | Article in Journal | | 2012 |
| St Féichín of Fore and his monastery | Masterson, Rory | Article in Book | Geography Publications | 2022 |
| St Mary's Church, Buttevant, Co. Cork 1828-1886 : notes on its building history | O'Brien, James | Article in Book | | 2013 |
| St Mary's parish Athlone : a history | O'Brien, Gearoid | Monograph or Collective Volume | St Mel's Diocesan Trust | 1989 |
| St Michael's, Cootehill : a brief history of the church, its buildings, its people | O'Brien, Hugh B. | Monograph or Collective Volume | [s.n.] | 1993 |
| St Patrick : the real story of Patrick who became Ireland's patron saint | Simms, George Otto | Monograph or Collective Volume | O'Brien Press | 1991 |
| St Wolstan's Holy Faith Secondary School : souvenir book, 1955-1999 | | Monograph or Collective Volume | St Wolstan's Secondary School | 1999 |
| St. Ann's Hill Hydro and its links to golf's fledgling days in the Barony of Muskerry | O'Brien, Tim | Article in Journal | | 2011 |
| Stakeknife : Britain's secret agents in Ireland | Harkin, GregIngram, Martin | Monograph or Collective Volume | O'Brien Press | 2004 |
| Stalwarts of the garrison : some Irish academics in Australia | Smith, Francis Barrymore | Article in Book | | 1991 |
| State intervention and the medical relief of the Irish poor, 1787-1850 | O'Brien, Gerard | Article in Book | | 1999 |
| State of Ireland | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | [s.n.] | 1972 |
| States of Ireland | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | Hutchinson | 1972 |
| Staying the distance | Delaney, Ronnie | Monograph or Collective Volume | O'Brien Press | 2006 |
| Stephens, Devoy, Tom Clarke | Ryan, Desmond | Article in Book | | 1960 |
| Steps and steeples : Cork at the turn of the century | Lincoln, Colm | Monograph or Collective Volume | O'Brien Press | 1980 |
| Stories from a sacred landscape : Crogan Hill to Clonmacnoise | O'Brien, Caimin | Monograph or Collective Volume | Offaly County Council|Mercier Press | 2006 |
| Stories my mother told me: collecting folklore from a woman of Clonmel, Co. Tipperary | O'Connor, Anne | Article in Book | | 2019 |
| Stray historical items from the Green Mountain State | O'Brien, Michael J. | Article in Journal | | 1919 |
| Streamstown in 1900 | O'Brien, Seamus | Article in Book | | 2002 |
| Streamstown's first national school 1861-1902 | O'Brien, Seamus | Article in Book | | 2002 |
| Striking back : the untold story of an anti-apartheid striker | Manning, MaryO'Brien, Sinéad | Monograph or Collective Volume | Collins Press | 2017 |
| Strong words, brave deeds : the poetry, life and times of Thomas O'Brien volunteer in the Spanish civil war | | Monograph or Collective Volume | O'Brien Press | 1994 |
| Strongbow : the Norman invasion of Ireland | Kostick, Conor, 1964- | Monograph or Collective Volume | O'Brien | 2013 |
| Studies in Irish history, 1649-1775 | | Monograph or Collective Volume | [s.n.] | 1903 |
| Studies in Irish, British and Australian relations, 1916-1963: trade, diplomacy and politics | O'Brien, John B. | Monograph or Collective Volume | Four Courts Press | 2005 |
| Summary conclusions [of finds] | FitzPatrick, ElizabethWalsh, Paul | Article in Book | | 2004 |
| Surprising discoveries in County Tipperary | Farrelly, JeanO'Brien, Caimin | Article in Journal | | 1996 |
| Survey of the holy wells in Moycashel barony | O'Brien, Caimin | Article in Book | Geography Publications | 2022 |
| Swift's medical friends | Le Fanu, William Richard | Article in Book | | 1978 |
| T. W. Rolleston, W. B. Yeats and the new history of Ireland controversy | O'Brien, Maria | Article in Journal | | 2002 |
| Ta Siad ag Teacht : Guinness as a Signifier of Irish Cultural Transformation | O'Brien, Eugene | Article in Book | | 2009 |
| Taney : progress of a parish : a social and historical profile of the parish of Taney in Dublin | Robinson Tweed, Carol | Monograph or Collective Volume | O'Brien Press | 2018 |
| Teachers learning and life in Streamstown National School since 1902 | Stokes, Dick | Article in Book | | 2002 |
| Telling our story : recording audiovisual testimonies from political conflict | McLaughlin, Cahal | Article in Book | | 2004 |
| Ten thousand years deep : the story of Ireland's peatlands | Krieger, Carsten | Monograph or Collective Volume | O'Brien Press | 2025 |
| Terence Albert O'Brien's speech from the scaffold | Walsh, Edward F. | Article in Journal | | 1997 |
| Terence Albert O'Brien, O.P. | Valkenburg, Augustine | Article in Book | | 2005 |
| Terrorism under democratic conditions : the case of the IRA | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1983 |
| Terryglass schools | O'Brien, Brigid | Article in Journal | | 1990 |
| That'll never work : success stories from private Irish business | Gaffney, MichaelO'Brien, Colin | Monograph or Collective Volume | Mercier Press | 2008 |
| The "Scotch-Irish" myth | O'Brien, Michael J. | Article in Journal | | 1925 |
| The 1581 inquisition post mortem of Conor O'Brien, third earl of Thomond | O'Halloran, Robert | Article in Journal | | 2025 |
| The 1626 rental of Thomond property | Breen, Martin | Article in Journal | | 2013 |
| The 1626 rental of Thomond property | Breen, Martin | Article in Journal | | 2014 |
| The 1641 Rebellion in County Westmeath | Cunningham, John, 1984- | Article in Book | Geography Publications | 2022 |
| The 1825-6 Commissioners of Irish Education reports : background and context | O'Brien, Gillian | Article in Book | | 2013 |
| The 1848 petitions : the William Smith O'Brien petition/records at the National Archives of Ireland | | Monograph or Collective Volume | Eneclann | 2001 |
| The 1848 William Smith O'Brien petition | Medlycott, Elinor (née Nuttall) | Article in Journal | | 2002 |
| The 1890's and 1900's in Clare | MacLysaght, Edward | Article in Book | | 1979 |
| The 1920s in Donegal | Simms, George Otto | Article in Book | | 1979 |
| The 1930's on Aran | Ó hEithir, Breandán | Article in Book | | 1979 |
| The 1940's and 60's in Derry | McCafferty, Nell | Article in Book | | 1979 |
| The 1950s : Ireland in pictures | | Monograph or Collective Volume | O'Brien Press | 2013 |
| The 1960s : Ireland in pictures | | Monograph or Collective Volume | O'Brien Press | 2011 |
| The 1970s : Ireland in pictures | | Monograph or Collective Volume | O'Brien Press | 2013 |
| The 1980s : Ireland in pictures | | Monograph or Collective Volume | O'Brien Press | 2013 |
| The administration of the Charitable Infirmary | Kenny, James | Article in Book | | 1987 |
| The Anglo-Norman conquest and settlement | Masterson, Rory | Article in Book | Geography Publications | 2022 |
| The appeal of the United Irish League in co. Roscommon 1903-7 | Clarke, Marie | Article in Journal | | 1994 |
| The Aran Islands : as world of stone : history, traditions, landscape, stories | Fitzgerald, Mairéad Ashe | Monograph or Collective Volume | O'Brien Press | 2003 |
| The archaeological excavations on the N7 Nenagh bypass 1998-1999 | O'Brien, Richard | Article in Journal | | 2001 |
| The arms trial | O'Brien, Justin | Monograph or Collective Volume | Gill & Macmillan | 2000 |
| The art of writing : the influence of Spanish literary culture on the work of Kate O'Brien | Davison, Jane | Thesis | | |
| The Athlone relief road and Shannon Bridge | Hearn, J. P. | Article in Book | | 1991 |
| The autobiography of Theobald Wolfe Tone, 1763-98. 2 vols. | | Monograph or Collective Volume | | 1911 |
| The ballad of Dinny Byrne 1798 | O'Brien, Larry | Article in Journal | | 1992 |
| The Ballinroane Estate of the Earl of Clanricarde 1641-1701 | O'Brien, Alfie | Article in Journal | | 2009 |
| The Bank of Ireland, 1783-1946. With an architectural chapter by C. P. Curran and biographical notes by J. Hone | Hall, F. G.O'Brien, G. | Monograph or Collective Volume | | 1949 |
| The banning and unbanning of Kate O'Brien's "The Land of Spices" | Fischerova, Jana | Article in Journal | | 2018 |
| The Battle for Liberty Hall | Watts, Gerry | Article in Journal | | 2015 |
| The battle of Dysert O'Dea, May 10, 1318 | Westropp, Thomas Johnston | Article in Journal | | 1918 |
| The Battle of Glenmalure, 25 August 1580 - cause and course | O'Byrne, Emmett | Article in Journal | | 1998 |
| The battle of Knockanuss | O'Brien, B. | Article in Journal | | 1968 |
| The battle of Liscarroll - 3rd September 1642 | O'Brien, B. | Article in Journal | | 2001 |
| The Battle of Mount Street Bridge | O'Brien, Paul | Article in Journal | | 2017 |
| The beatified martyrs of Ireland (10) : Terence Albert O'Brien, O.P., Bishop of Emly | Valkenburg, Augustine | Article in Journal | | 2001 |
| The Beckett Country revisited : Beckett; belonging and longing | Kennedy, Séan | Article in Book | | 2005 |
| The beginning of the veto controversy in Ireland | O'Brien, Gerard | Article in Journal | | 1987 |
| The Benedictine priory of Kilcommon | O'Brien, Richard | Article in Journal | | 2003 |
| The Bentley family of Hurdlestown, Co. Clare | O'Brien, Patrick | Article in Journal | | 1986 |
| The Best from The Bell | MacMahon, Sean | Monograph or Collective Volume | O'Brien Press | 1978 |
| The bicentenary of the Royal College of Surgeons in Ireland, 1784-1984 | | Monograph or Collective Volume | Glendale | 1987 |
| The black Donnellys and the blackest crime in the history of Canada | O'Brien, Denis | Article in Journal | | 1997 |
| The Blasket Islands : next parish America | Stagles, JoanStagles, Ray | Monograph or Collective Volume | O'Brien Press | 1980 |
| The Blasket Islands : next parish America | Stagles, JoanStagles, Ray | Monograph or Collective Volume | O'Brien Press | 2006 |
| The Blasket Islands : next parish to America | Anonymous | Monograph or Collective Volume | O'Brien Press | 1980 |
| The Blessed Virgin Mary | O'Brien, Susan | Article in Book | Oxford University Press | 2023 |
| The book of Finglas | O'Brien, Seán | Monograph or Collective Volume | Kincora Press | 1980 |
| The Book of Leinster, formerly Lebar na Núachongbála. 5 vols. | | Monograph or Collective Volume | Institute for Advanced Studies | 1954 |
| The borough of Wicklow | O'Brien, Andrew | Article in Journal | | 2002 |
| The breath of hell's door : private William McCarter and the Irish Brigade at Fredericksburg | O'Brien, Kevin E. | Article in Journal | | 1994 |
| The Briens of Brawney, otherwise Uí Braoin Breaghmhaine | Cox, Liam, 1908-2003 | Article in Journal | | 1980 |
| The British government and Archbishop Daniel Mannix | O'Brien, John | Article in Journal | | 1988 |
| The Broighter hoard - a question of ownership | Warner, Richard | Article in Book | | 1999 |
| The Bronze age copper mines of the Goleen area, Co. Cork | O'Brien, William | Article in Journal | | 2003 |
| The Brother | Ó Nualláin, Micheál | Article in Journal | | 2011 |
| The burden of Irish history | Edwards, Owen Dudley | Article in Book | | 1969 |
| The Burkes of Tintrim House, Whitegate : what happened to the son and heir Edmund Burke? | Crawford-Ooppenheimer, ChristineMadden, PaddyO'Brien, Alfie | Article in Journal | | 2007 |
| The business of being a goldsmith in eighteenth-century Dublin | Fitzgerald, Alison | Article in Book | | 2008 |
| The Butlers of Lower Grange, viscounts Galmoy | O'Brien, Seán | Article in Journal | | 1964 |
| The Byrnes of Ballymanus | O'Brien, Conor, 1933- | Article in Book | | 1994 |
| The Byrnes of Ballymanus and the Gabhal Raghnaill connection | O'Brien, Conor, 1933- | Article in Journal | | 1998 |
| The castle at Ballingarry, County Tipperary : a fourteenth-century Gaelic castles | O'Brien, Caimin | Article in Book | | 2007 |
| The Catholic middle classes in pre-Famine Cork | O'Brien, John B. | Monograph or Collective Volume | National University of Ireland | 1980 |
| The Catholic University of Ireland: financial contributions from the diocese of Waterford and Lismore | Hearne, John M. | Article in Journal | | 2016 |
| The Celtic cross at Limburg an der Lahn : a sentimental journey | O'Brien, Anthony | Article in Journal | | 2001 |
| The Celtic cross at Limburg an der Lahn, Germany: a sentimental journey | O'Brien, Anthony | Article in Journal | | 2005 |
| The Celtic way of life | Anonymous | Monograph or Collective Volume | O'Brien Press | 1976 |
| The Celtics, 1884-1994 : a centenary history of the G.A.A. in Cootehill | O'Brien, Hugh B. | Monograph or Collective Volume | # | 1994 |
| The centenary of Rev. Sylvester Malone, great Catholic and great citizen | O'Brien, Denis R. | Article in Journal | | 1921 |
| The Chancellorship of medieval Leighlin | O'Brien, Niall C.E.J. | Article in Journal | | 2019 |
| The changing of the guard at Middle Abbey Street, 1961-73 | Horgan, John | Article in Book | | 2012 |
| The Charitable Infirmary in Jervis Street : chronology of a voluntary hospital | O'Brien, Eoin | Article in Book | | 1987 |
| The Charitable Infirmary in Jervis Street : the first voluntary hospital in Great Britain and Ireland | O'Brien, Eoin | Article in Book | | 1987 |
| The Charitable Infirmary, Jervis Street, 1718-1987 : a farewell tribute | | Monograph or Collective Volume | Anniversary | 1987 |
| The charities and famine in mid-nineteenth-century Ireland | O'Neill, Timothy P. | Article in Book | NA | 1999 |
| The charter day meeting in the Rotunda | Browne, Alan | Article in Book | | 1987 |
| The churches of Frederick Darley Jnr: identification and attribution | O'Brien, Colm | Article in Journal | | 2013 |
| The City of Londonderry : demographic trends and socio-economic characteristics 1650-1900 | Thomas, Colin | Article in Book | | 1999 |
| The civil rights crisis, 1962-9 | Corbett, Robin | Article in Book | | 1985 |
| The Clareabbey charter revisited | Mac Mahon, Michael | Article in Journal | | 2013 |
| The collected letters of Canon Sheehan of Doneraile 1883-1913 | | Monograph or Collective Volume | Smenos | 2013 |
| The collected letters of Flann O'Brien | | Monograph or Collective Volume | Dalkey Archive Press | 2018 |
| The Colpoys of County Clare | O'Brien, Grania R. | Article in Journal | | 2008 |
| The Confederation of Kilkenny | Donelan, J. | Article in Book | | 1906 |
| The Congo (ONUC) : the political perspective | O'Brien, Conor Cruise, 1917-2008 | Article in Journal | | 1996 |
| The Congregation of Propaganda and the publication of Dr O'Brien's Irish dictionary, 1768 | Jones, F. M. | Article in Journal | | 1952 |
| The Connecticut Irish in the revolution | O'Brien, Michael J. | Article in Journal | | 1923 |
| The contributaion of female artists to the growing Irish nationalist movement | Roseingrave, Breda | Article in Journal | | 2013 |
| The Cootehill affair: the 'Black Walk', 12 August 1931 | O'Brien, Hugh B.
| Article in Journal | | 2017 |
| The corn and flour mills of County Westmeath | Mimnagh, Seamus | Article in Book | Geography Publications | 2022 |
| The council books of the corporation of the city of Cork | O'Brien, John B. | Article in Journal | | 1987 |
| The Cratloe O'Briens | O'Brien, P. I. D. | Article in Journal | | 1980 |
| The Crehore family of Massachusetts | O'Brien, Michael J. | Article in Journal | | 1918 |
| The Creightons of Inver and Killaghtee | O'Brien, Felim | Article in Journal | | 1985 |
| The Crimean monument at Carrick: one tower, several stories | Bennett, IsabelMandal, StephenO'Brien, Derek | Article in Book | | 2019 |
| The cruiser and the colonist : Conor Cruise O'Brien's writings on colonialism | Howe, Stephen | Article in Journal | | 2013 |
| The Cumberland County, Pennsylvania, militia in the revolution | O'Brien, Michael J. | Article in Journal | | 1922 |
| The dance hall | O'Brien, Flann | Article in Journal | | 1941 |
| The darkness echoing : exploring Ireland's places of famine, death and rebellion | O'Brien, Gillian | Monograph or Collective Volume | Doubleday Ireland | 2020 |
| The dating of the Mt Gabriel-type copper mines of West Cork | O'Brien, William | Article in Journal | | 1987 |
| The decline of the aristocratic estates of County Westmeath, 1879-1923 | Dunne, Eugene | Article in Book | Geography Publications | 2022 |
| The development and evolution of the medieval borough and port of Dungarvan, County Waterford, c. 1200 to c. 1530 | O'Brien, A. F. | Article in Journal | | 1987 |
| The development of the hillfort in prehistoric Ireland | O'Brien, William | Article in Journal | | 2017 |
| The development of the privileges, liberties and immunities of medieval Cork and the growth of an urban autonomy c. 1189 to 1500 | O'Brien, A. F. | Article in Journal | | 1985 |
| The development of the university, 1991-2006 | Roebuck, Peter | Article in Book | | 2009 |
| The diary of Edward Colclough Byrne | O'Brien, C.O'Brien, Conor, 1933- | Article in Journal | | 1996 |
| The diary of Edward Joseph Colclough Byrne, part 2 | Byrne, Edward Joseph ColcloughO'Brien, Conor, 1933- | Article in Journal | | 1997 |
| The dirty dozen : Ireland's motor-sport legends | Kenny, John | Monograph or Collective Volume | O'Brien Press in association with RTE | 2007 |
| The discourses of Irish Jewish Studies: Bernard Shaw, Max Nordau, and evocations of the cosmopolitan | Watt, Stephen | Article in Book | | 2018 |
| The distinctiveness of the English poor laws, 1750-1850 | Innes, Joanna | Article in Book | | 2002 |
| The divided province : the troubles in Northern Ireland, 1969-85 | | Monograph or Collective Volume | Orbis | 1985 |
| The Dublin anti-union riot of 3 December 1759 | Murphy, Seán | Article in Book | Irish Academic Press | 1989 |
| The Dublin cattle market's decline, 1955-73 | O'Brien, Declan | Monograph or Collective Volume | Four Courts Press | 2021 |
| The Dublin Cattle Market's Decline, 1955-73 | O'Brien, Declan | Monograph or Collective Volume | Four Courts | 2021 |
| The Dublin Cattle Market's decline, 1955-73 | O'Brien, Declan | Article in Journal | | 2023 |
| The Dublin marathon : celebrating 40 years | McGoldrick, Sean | Monograph or Collective Volume | O'Brien Press | 2019 |
| The Dublin Parliament of 1297 | O'Brien, A. F. | Article in Journal | | 2000 |
| The earl and the bishop : further lights on the Thomond and O'Dea monuments in St. Mary's Cathedral, Limerick | Tait, Clodagh | Article in Journal | | 2002 |
| The Earl of Desmond's navy | O'Brien, Niall | Article in Journal | | 2008 |
| The earl of Thomond and the poets, A.D. 1576 | Ó Cuív, Brian | Article in Journal | | 1977 |
| The Earl of Thomond's 1615 Survey of Ibrickan, Co. Clare | McInerney, Luke | Article in Journal | | 2013 |
| The Earl of Thomond's dispute with the Lord of Kerry and the fate of Bunratty library, 1639-41 | Ó Dálaigh, Brian | Article in Journal | | 2004 |
| The Earl of Thomond's letter to a London jeweller, 1595 | Ó Dálaigh, Brian | Article in Journal | | 2005 |
| The Earls of Thomond and their burial monuments, 1543-1741 | Ó Dálaigh, Brian | Article in Journal | | 2016 |
| The early castles at Dromoland: Some historical notes | Breen, MartinUa Cróinín, Ristéard | Article in Journal | | 2019 |
| The early ecclesiastical complexes of Carrowmore and Clonca and their landscape context in Inishowen, county Donegal | Adams, MaxHaycock, DebO'Brien, ColmO'Meara, DonPennie, Jack | Article in Journal | | 2014 |
| The early Irish in Maine | O'Brien, Michael J. | Article in Journal | | 1911 |
| The early writings of Conor Cruise O'Brien | | Monograph or Collective Volume | Academica Press | 2001 |
| The early years of Brian O'Nolan, Flann O'Brien, Myles Na gCopaleen | Ní Nualláin, RoisínO'Nolan, NiallÓ Nualláin, Ciaran | Monograph or Collective Volume | Lilliput Press | 1998 |
| The early years of the Dublin Lying-in Hospital | Ross, Ian Campbell | Article in Book | | 1986 |
| The earthwork castles of Anglo-Norman Offaly | O'Brien, Caimin | Article in Book | | 1998 |
| The East Breakwater | O'Brien, Andrew | Article in Journal | | 2007 |
| The Easter Rising : a guide to Dublin in 1916 | Collins, LorcanKostick, Conor, 1964- | Monograph or Collective Volume | O'Brien Press | 2000 |
| The economic history of Ireland from the Union to the famine | O'Brien, George, 1892-1973 | Monograph or Collective Volume | | 1921 |
| The economic history of Ireland in the eighteenth century | O'Brien, George, 1892-1973 | Monograph or Collective Volume | | 1918 |
| The economic history of Ireland in the seventeenth century | O'Brien, George, 1892-1973 | Monograph or Collective Volume | | 1919 |
| The embers of Easter, 1916-1966 | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1968 |
| The Emergency years - a vignette | O'Brien, Grania R. | Article in Journal | | 2005 |
| The emigration of Irish work-house children to Australia in the nineteenth century | Robins, Joseph | Article in Book | | 1991 |
| The endless war, 1977-85 | Jeffery, Keith | Article in Book | | 1985 |
| The epistemology of nationalism | O'Brien, Eugene | Article in Journal | | 1996 |
| The establishment of poor-law unions in Ireland, 1838-43 | O'Brien, Gerard | Article in Journal | | 1982 |
| The estate of Maurice Brown of Rathmoylan: its origins and descent | O'Brien, Niall | Article in Journal | | 2008 |
| The ethics of giving and receiving: a study of the Iveagh Markets, Dublin | Martin-McAuliffe, Samantha L. | Article in Book | | 2012 |
| The evidence for the importation and use of foreign limestone in Cork city and county during the later medieval period | O'Brien, Derek | Article in Journal | | 2017 |
| The excecution of the 'Manchester Martyrs', 1867: Special Constable Samuel Page's letter to his mother | McNamara, Conor | Article in Journal | | 2011 |
| The family of O'Brien Butler (1763-1954) | Butler, Patrick Theobald Tower, 28th baron Dunboyne, 1917-2004 | Article in Journal | | 1990 |
| The family register of the O'Briens of Newcastle, Ballyporeen, county Tipperary | Clare, Wallace | Article in Journal | | 1953 |
| The family silver : a memoir of depression and inheritance | O'Brien, Sharon | Monograph or Collective Volume | Chicago University Press | 2004 |
| The Famine clearance in Toomevara, County Tipperary | O'Brien, Helen | Monograph or Collective Volume | Four Courts | 2010 |
| The famine in Broadford parish | O'Brien, Patrick | Article in Journal | | 1993 |
| The fictional Irishman 1665-1850 | O'Brien, George, 1945- | Article in Journal | | 1977 |
| The finds : an overview | FitzPatrick, Elizabeth | Article in Book | | 2004 |
| The first and final phases of the Irish medical students at the university of Leyden | Underwood, Edgar Ashworth | Article in Book | | 1978 |
| The first census of the United States, some pointed comments on the manner of taking same and the results thereof. An interesting paper on a subject not heretofore touched by the society | O'Brien, Michael J. | Article in Journal | | 1909 |
| The first forty years : C.L.C.G., Cumann Peile an Athar Ó Griobhtha (Gaillimh) : a history of the Fr. Griffin Gaelic football club and juvenile wing - St Augustine's | | Monograph or Collective Volume | Father Griffin Gaelic Football Club | 1991 |
| The first man on the hill: The life and times of Rev. Patrick O'Connell (1850-1923) | O'Brien, Hugh B. | Article in Journal | | 2012 |
| The first memorial to Roger Casement | O'Brien, Seumas | Article in Journal | | 1951 |
| The first regiment of the Pennsylvania line - the most famous body of men in the continental army | O'Brien, Michael J. | Article in Journal | | 1922 |
| The Fishmongers' Company of London and the Londonderry plantation, 1609-41 | Hunter, R. J. (Robert J.) | Article in Book | | 1999 |
| The flight of the Earl : Hugh O'Neill as an index of Irish cultural liminality | O'Brien, Eugene | Article in Book | | 2005 |
| The Foundation of Australia, 1786-1800 : A Study in English Criminal Practice and Penal Colonization in the Eighteenth Century | O'Brien, Eris M. | Monograph or Collective Volume | Sheed & Ward | 1937 |
| The foundation of the National Library of Ireland, 1836-1877 | Long, Gerard | Article in Journal | | 1991 |
| The Free Trade crisis : a reappraisal | Lammey, David | Article in Book | | 1989 |
| The full shilling | Liddy, James, 1934- | Monograph or Collective Volume | Salmon Poetry | 2008 |
| The funeral of William Smith O'Brien | McMahon, Jerry | Article in Journal | | 1990 |
| The Furrow : navigating the rapids, 1950-77 | Horgan, John | Article in Book | | 2014 |
| The Gaelic Athletic Association in Westmeath, 1884-1905 | Hunt, Tom | Article in Book | Geography Publications | 2022 |
| The gap of the north : the archaeology and folklore of Armagh, Down Louth and Monaghan | Cunningham, NoreenMcGinn, Patrick | Monograph or Collective Volume | O'Brien | 2001 |
| The Gasmakers : historical perspectives on the Irish gas industry | O'Sullivan, Charles J. | Monograph or Collective Volume | O'Brien Press; Irish Gas Association | 1987 |
| The genealogy of the O'Byrnes of Ranelagh | Nicholls, K. W. (Kenneth W.) | Article in Journal | | 1998 |
| The General : godfather of crime | Williams, Paul | Monograph or Collective Volume | O'Brien Press | 1995 |
| The generalship of Brian Boru | O'Brien, B. | Article in Journal | | 1970 |
| The genesis of "Protestant ascendancy" : The Rightboy Disturbances of the 1780s and Their Impact Upon Protestant Opinion | Kelly, James, 1959- | Article in Book | | 1989 |
| The geographical setting | Camblin, GilbertMcCourt, Desmond | Article in Book | | 1999 |
| The Glynns of Kilrush, County Clare, 1811–1940: Family, business and politics | O'Brien, Paul | Monograph or Collective Volume | Four Courts Press | 2019 |
| The golden age of the Irish Franciscans, 1615-50 | Mooney, Canice | Article in Book | | 1944 |
| The Goldsmiths of Waterford | O'Brien, Conor | Article in Journal | | 2007 |
| The goldsmiths of Waterford | O'Brien, Conor | Article in Journal | | 2003 |
| The governors of the Charitable Infirmary and its managing committee | McCarthy, Denis P. | Article in Book | | 1987 |
| The Grand National : the Irish at Aintree | Holland, Anne | Monograph or Collective Volume | O'Brien Press | 2008 |
| The Granite Coast: Dún Laoghaire, Sandycove, Dalkey | Pearson, Peter | Monograph or Collective Volume | The O'Brien Press | 2022 |
| The Grattan mystique | O'Brien, Gerard | Article in Journal | | 1986 |
| The Great Famine in Ireland and a retrospect of fifty years 1845-95, with a sketch of the present condition and future prospects of the congested districts | O'Brien, W. P. | Monograph or Collective Volume | NA | 1896 |
| The Great Gale of 1861 | O'Brien, Andrew | Article in Journal | | 2005 |
| The great melody - discordant notes | O'Brien, Conor Cruise, 1917-2008 | Article in Journal | | 1993 |
| The great melody : a thematic biography and commented anthology of Edmund Burke | O'Brien, C. C. | Monograph or Collective Volume | | 1992 |
| The Great Pretender and Dean Swift to Flann O'Brien: from Ireland the novel in English | Colhoun, William James | Thesis | | |
| The Guinness story | Bourke, Edward J. | Article in Journal | | 2011 |
| The Guinness story : the family, the business, the black stuff | Bourke, Edward J. | Monograph or Collective Volume | O'Brien Press | 2009 |
| The Hacketts : glimpses of entrepreneurial life in Cork 1800-1870 | O'Brien, John B. | Article in Journal | | 1985 |
| The Halpin monument | O'Brien, Andrew | Article in Journal | | 2006 |
| The Haughey file : the unprecedented career and last years of the Boss | Collins, Stephen | Monograph or Collective Volume | O'Brien Press | 1992 |
| The heart of Dublin : resurgence of an historic city | Pearson, Peter | Monograph or Collective Volume | O'Brien | 2000 |
| The hidden hand of God : the life of Veronica O'Brien and our common apostolate | Suenens, Léon Joseph | Monograph or Collective Volume | Vertias | 1994 |
| The historian as writer or critic? : Conor Cruise O'Brien and his biographers | McCormack, W. J. | Article in Journal | | 1996 |
| The historical revitalization of Hebrew as a model for the revitalization of Irish? | Ó Laoire, Muiris | Article in Book | | 2018 |
| The history of the O'Brien and Leddin families | O'Brien, James V. | Article in Journal | | 1988 |
| The Honan Chapel's St John window: journey of the beloved disciple | Rogers, Jessie | Article in Book | | 2018 |
| The Honourable Mary Spring Rice | O'Brien, D. | Article in Journal | | 1939 |
| The House of Industry hospitals 1772-1987 : the Richmond, Whitworth and Hardwicke (St Laurence's hospital a closing memoir) | Browne, LornaO'Brien, EoinO'Malley, Kevin | Monograph or Collective Volume | Anniversary | 1988 |
| The impact of the Anglo-Normans on Munster | O'Brien, A. F. | Monograph or Collective Volume | Barryscourt Trust | 1997 |
| The impact of the Anglo-Normans on Munster | O'Brien, A. F. | Article in Book | | 2004 |
| The impact of the war on the Irish economy | O'Brien, George, 1892-1973 | Article in Journal | | 1946 |
| The importance of being Irish in colonial South Australia | Richards, Eric, 1940- | Article in Book | | 1991 |
| The Inchiquin collection: a new perspective on an ancient Clare family | Berry, Róisín | Article in Journal | | 2006 |
| The Inchiquin manuscripts | | Monograph or Collective Volume | Stationery Office [for the Irish Manuscripts Commission] | 1961 |
| The industrial houses of Cork : a proposed typological framework | O'Brien, Elena | Article in Journal | | 2006 |
| The Industrial School child in Ennis 1880-1907 | O'Brien, Jane | Article in Journal | | 2018 |
| The Invincibles : The Phoenix Park Assassinations and the conspiracy that shook an Empire | Kenna, Shane | Monograph or Collective Volume | The O'Brien Press | 2019 |
| The Irish anatomist : a study of Flann O'Brien | Donohue, Keith | Monograph or Collective Volume | Academica Press | 2003 |
| The Irish ancestry of Theodore Roosevelt | O'Brien, Michael J. | Article in Journal | | 1918 |
| The Irish and the great war : a case of amnesia | Myers, Kevin | Article in Book | | 1998 |
| The Irish at Bunker Hill : evidence of Irish participation in the battle of 17th June 1775 | O'Brien, Michael JosephSullivan, A. M.Sullivan, Catherine | Monograph or Collective Volume | Irish University Press | 1968 |
| The Irish burghers of New Amsterdam and freemen of New York | O'Brien, Michael J. | Article in Journal | | 1918 |
| The Irish church in the eleventh and twelfth centuries | Gwynn, AubreyO'Brien, Gerard | Monograph or Collective Volume | | 1992 |
| The Irish emigrant experience in Australia | | Monograph or Collective Volume | Poolbeg | 1991 |
| The Irish factor in Anglo-American relations | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | The English Speaking Union | 1979 |
| The Irish free trade agitation of 1779 | O'Brien, George, 1892-1973 | Article in Journal | | 1924 |
| The Irish in Australia, 1945-68 | O'Brien, John | Article in Book | | 1984 |
| The Irish in Charleston, South Carolina | O'Brien, Michael J. | Article in Journal | | 1926 |
| The Irish in Montgomery and Washington Counties, Maryland, in 1778 | O'Brien, Michael J. | Article in Journal | | 1925 |
| The Irish in New London, Conn., in the 17th and 18th centuries : the interesting diary of Joshua Hempstead | O'Brien, M. J. | Article in Journal | | 1927 |
| The Irish in Queensland : an overview | MacGinley, M. E. R. | Article in Book | | 1991 |
| The Irish in the American colonies | O'Brien, M. J. | Article in Journal | | 1927 |
| The Irish in the American melting-pot | O'Brien, George, 1892-1973 | Article in Journal | | 1946 |
| The Irish in the Dutch records of the city of New York | O'Brien, M. J. | Article in Journal | | 1928 |
| The Irish in the New Jersey probate records | O'Brien, M. J. | Article in Journal | | 1928 |
| The Irish language in Westmeath, c.1600-1900 | Ó Fionnagáin, Aengus | Article in Book | Geography Publications | 2022 |
| The Irish novel, 1960-2010 | O'Brien, George, 1945- | Monograph or Collective Volume | Cork University Press | 2012 |
| The Irish Parliamentary Party and the third Home Rule crisis | McConnel, James | Monograph or Collective Volume | Four Courts | 2013 |
| The Irish Parliamentary Party machine, 1874-85 | O'Brien, C. C. | Article in Journal | | 1946 |
| The Irish parliamentary party, 1880-90 | O'Brien, Conor Cruise | Thesis | | 1954 |
| The Irish revolution and how it came about | O'Brien, William | Monograph or Collective Volume | Maunsel and Roberts | 1923 |
| The Irish revolutionary movement and W. M. Hughes : 1916-1922 | O'Brien, John B. | Article in Book | | 2000 |
| The Irish Sketches of Florence Vere O'Brien | | Monograph or Collective Volume | Ballinakella Press | 2017 |
| The Irish song tradition | O'Boyle, Seán | Monograph or Collective Volume | O'Brien | 1976 |
| The Irish staple organisation in the reign of James I | O'Brien, George, 1892-1973 | Article in Journal | | 1926 |
| The Irish Times : a history | O'Brien, Mark | Monograph or Collective Volume | Four Courts | 2008 |
| The Irish town : an approach to survival | Shaffrey, Patrick | Monograph or Collective Volume | O'Brien Press | 1975 |
| The Irish Victory Fund and the United Jewish Appeal as Nation-Building projects | Lainer-Vos, Dan | Article in Book | | 2018 |
| The Irish-American literary connection | O'Brien, Peggy | Article in Book | | 1980 |
| The Irish-English dictionary of Bishop John O'Brien, 1768 | Ó Cearnaigh, Seán | Article in Journal | | 1993 |
| The Joy | Howard, Paul | Monograph or Collective Volume | O'Brien Press | 1996 |
| The Kane family in America | O'Brien, Michael J. | Article in Journal | | 1918 |
| The Kelly's, Burkes and Shea's of the Massachusetts line | O'Brien, Michael Joseph | Article in Journal | | 1922 |
| The Kellys, Burkes and Sheas of the Massachusetts line | O'Brien, Michael J. | Article in Journal | | 1922 |
| The Kildare plate and O'Brien of Thomond | Ó Dálaigh, Brian | Article in Journal | | 2003 |
| The Kilnaruane pillar stone, Bantry, County Cork | O'Brien, Mary T. | Article in Book | | 2013 |
| The labour and the 'Royal' | Mac Thomáis, Éamonn, 1927-2002 | Monograph or Collective Volume | O'Brien Press | 1979 |
| The Lalors of Tenakill, 1767-1893 | O'Brien, Michael Gerard | Thesis | | 1987 |
| The land and people in Ireland | Colum, PadraicO'Brien, Elinor | Monograph or Collective Volume | Lippincott | 1953 |
| The land and people of nineteenth-century Cork | O'Brien, John B. | Article in Journal | | 1975 |
| The land problem in Ireland and its settlement | O'Brien, T.O'Shiel, Kevin R., | Monograph or Collective Volume | The Stationery Office | 1966 |
| The last days of Terence MacSwiney | O'Brien, Art | Article in Book | | 2016 |
| The last speech and prayer of Blessed Terence Albert O'Brien, Bishop of Emly, 1651 | | Article in Journal | | 1996 |
| The Last word : reflections on 'Angela's Ashes' | O'Brien, George, 1945- | Article in Book | | 2000 |
| The last years of Bishop T. A. O'Brien, O.P. | Taheny, L. | Article in Book | | 1951 |
| The law and Mrs Murphy | Shannon, James P. | Article in Journal | | 2009 |
| The legacy of General O'Brien in Chile | Morrin, Fergal | Article in Book | | 2006 |
| The legacy of John Bramhall as Laud's alter-ego | Ross, Linda M. | Article in Book | | 1999 |
| The legacy of St Dymphna | O'Brien, Breege | Article in Journal | | 1999 |
| The letters of Mrs William O'Brien | O'Rahilly-Mahoney, Sean | Article in Journal | | 1984 |
| The Liberties of Dublin | | Monograph or Collective Volume | E. & T. O'Brien | 1973 |
| The life and career of William Martin Murphy | Yeates, Pádraig | Article in Book | | 2012 |
| The life and times of Feagh MacHugh O'Byrne (c.1544-1597) | O'Brien, Andrew | Article in Journal | | 1997 |
| The life of Lord Russell of Killowen | O'Brien, R. B. | Monograph or Collective Volume | | 1901 |
| The life of William O'Brien, the Irish nationalist. A biographical study of Irish nationalism, constitutional and revolutionary | MacDonagh, Michael | Monograph or Collective Volume | | 1928 |
| The location and context of Viking burials at Kilmainham and Islandbridge, Dublin | O'Brien, Elizabeth | Article in Book | | 1998 |
| The long war : the IRA and Sinn Féin from armed struggle to peace talks | O'Brien, Brendan | Monograph or Collective Volume | O'Brien Press | 1995 |
| The long war : the IRA and Sinn Féin, 1985 to today | O'Brien, Brendan | Monograph or Collective Volume | O'Brien Press | 1993 |
| The lost town of Cork, Maine | O'Brien M. J. | Article in Journal | | 1913 |
| The machinery of the Irish Parliamentary Party, 1880-5 | O'Brien, C. C. | Article in Journal | | 1946 |
| The making of the 1720 declaratory act | Victory, Isolde | Article in Book | | 1989 |
| The Manchester Martyrs | O'Neill, Joseph | Monograph or Collective Volume | Mercier | 2012 |
| The Manchester Martyrs, Part I | Desmond, JohnDesmond, Margaret | Article in Journal | | 2004 |
| The Manchester martyrs: a Victorian melodrama | Busteed, Mervyn A. | Article in Journal | | 2008 |
| The manor courts of the Earl of Thomond 1666-1686; presented by S.C. O'Mahony | O'Mahony, S. C. | Article in Journal | | 2004 |
| The manor house and castle of Clonroad | Ó Dálaigh, Brian | Article in Journal | | 2019 |
| The manuscript tradition of the Testament of Catháer Már | Dillon, Myles | Article in Book | | 1944 |
| The Material for Victory: The memoirs of Andrew J. Kettle | Kettle, Andrew J., 1833-1916 | Monograph or Collective Volume | Open Press at the University of Galway | 2023 |
| The medical board of the Charitable Infirmary | Osborne, Henry | Article in Book | | 1987 |
| The medical consultants of Dublin - a social and political portrait | Meenan, F. O. C. | Article in Book | | 1978 |
| The medieval churches of County Offaly | FitzPatrick, ElizabethO'Brien, Caimin | Monograph or Collective Volume | Government of Ireland | 1998 |
| The medieval county of Roscommon | O'Brien, Niall C.E.J. | Article in Journal | | 2019 |
| The merger and after, 1982-1991 | Pritchard, Rosalind,Roebuck, Peter, | Article in Book | | 2009 |
| The Midland Volunteers Force and the Irish Volunteers : towards reconciling history and historiography | Burke, John | Article in Book | Geography Publications | 2022 |
| The militia in Munster, 1715-1778 | O'Donovan, Jim | Article in Book | | 1989 |
| The missing personnel records of the R.I.C. | O'Brien, Gerard | Article in Journal | | 1999 |
| The Modern Prince : Charles J. Haughey and the Quest for Power | O'Brien, Justin | Monograph or Collective Volume | Merlin Publishing | 2002 |
| The Murphys in Virginia Patrick Murphy, a brave soldier of the Virginia continental line | O'Brien, Michael J. | Article in Journal | | 1922 |
| The national and the normal | Foster, R. F. (Robert Fitzroy) (Roy), 1949- | Article in Book | | 2009 |
| The Nenagh mutiny, 7 - 9 July 1856 | O'Brien, Louis | Article in Journal | | 2004 |
| The new Poor Law in prefamine Ireland : a case study | O'Brien, Gerard | Article in Journal | | 1985 |
| The New University of Ulster | Williamson, Arthur P. | Article in Book | | 2009 |
| The Normans in Thomond | Westropp, Thomas Johnston | Article in Journal | | 1890 |
| The novel and the short story in Ireland : readership, society and fiction, 1922-1965 | Halpen, Anthony | Thesis | | |
| The O'Brien family | O'Brien, Donough | Article in Journal | | 1939 |
| The O'Briens : a history of the Foreglen Gaelic Football Club 1888-1998 | Donnelly, Philip | Article in Journal | | 2000 |
| The O'Briens and MacMahons of Thomond, their patronage of the Franciscan Order, and their burial monuments | Ó Dálaigh, Brian | Article in Journal | | 2017 |
| The O'Briens in Munster after Clontarf | Ryan, John | Article in Journal | | 1942 |
| The O'Briens of Dough and Ennistymon | O'Brien, P. I. D. | Article in Journal | | 1984 |
| The O'Briens of Dromore Castle | O'Brien, Ivor | Article in Journal | | 1987 |
| The O'Briens of Fairfield, Co. Galway, the O'Brien relations of Florimond, Comte de Basteret | Casteleyn, Mary | Article in Journal | | 2004 |
| The O'Briens of Thomond and twelfth-century church reform | Casey, M. G. | Article in Journal | | 1934 |
| The O'Byrne Sept of Knockrath | Nicholls, K. W. (Kenneth W.) | Article in Journal | | 1998 |
| The O'Hickeys, hereditary physicians to the O'Briens of Thomond and some of their descendants | Hickey, J. | Article in Journal | | 1958 |
| The obsidional money of the great rebellion (1642-9) | Nelson, Philip | Article in Journal | | 1905 |
| The Old Irish life of St. Brigit | | Article in Journal | | 1939 |
| The oldest account of the raid of the Collas (circa A.D. 330) | | Article in Journal | | 1939 |
| The Orange Order | Jess, Mervyn | Monograph or Collective Volume | O'Brien Press | 2007 |
| The origins and development of the Cadet School | O'Brien, B. | Article in Journal | | 1979 |
| The origins of the European earthwork castle : north Tipperary, a case study | O'Brien, Caimin | Thesis | | 2001 |
| The origins of the senate of the Irish Free State | O'Brien, Donat Eoin | Thesis | | 1982 |
| The Oxford History of British and Irish Catholicism, Volume IV : Building Identity, 1830-1913 | | Monograph or Collective Volume | Oxford University Press | 2023 |
| The Park, Athlone. From brewery to secondary school | O'Brien, Gearoid | Article in Journal | | 2000 |
| The parliamentary history of the Irish land question from 1829 to 1869, and the origin and results of the Ulster custom | O'Brien, R. B. | Monograph or Collective Volume | | 1880 |
| The parliamentary history of the Irish land question from 1829-1869 | O'Brien, R. B. | Monograph or Collective Volume | | 1880 |
| The Parnell of real life | O'Brien, William | Monograph or Collective Volume | | 1926 |
| The pathology of revivalism. An unpublished manuscript by Myles na gCopaleen | Taaffe, Carol | Article in Journal | | 2006 |
| The peculiarities of Irish land tenure, 1800-1914 : from agent of impoverishment to agent of pacification | Gray, Peter, 1965- | Article in Book | | 2002 |
| The perception of policing change from the perspective of human-rights and non-governmental organisations | Beirne, Maggie,O'Brien, Martin | Article in Book | | 2010 |
| The Petworth House archives : a catalogue, vol. 3 | | Monograph or Collective Volume | West Sussex County Council | 1997 |
| The physical endowment of County Westmeath | Meehan, Robert | Article in Book | Geography Publications | 2022 |
| The pioneers : Larkin and O'Brien : the story of a feud | Lysaght, D. R. O'Connor | Article in Book | | 2013 |
| The pioneers : William O'Brien | Byrne, Brendan | Article in Book | | 2013 |
| The plantation of Ulster | Cox, S. A. | Article in Book | | 1906 |
| The political and military career of Murrough O'Brien, 6th baron and later 1st earl of Inchiquin, 1614-1650, with special reference to the confederate wars period | O'Doherty, Leon | Thesis | | 2009 |
| The political response, 1972-7 | Aughey, Arthur | Article in Book | | 1985 |
| The politics of despair : Independent Newspapers and post-war Irish society | Muprhy, Gary | Article in Book | | 2012 |
| The politics of Munster protestants, 1641-9 | Murphy, John A. | Article in Journal | | 1971 |
| The Poor Mouth : Flann O'Brien and the Gaeltacht | Gallagher, Monique | Article in Journal | | 1983 |
| The port of Galway : infrastructure, trade and commodities | Hartnett, Alexandra | Article in Book | | 2004 |
| The power game : Fianna Fáil since Lemass | Collins, Stephen | Monograph or Collective Volume | O'Brien | 2000 |
| The power game : Ireland under Fianna Fáil | Collins, Stephen | Monograph or Collective Volume | O'Brien Press | 2001 |
| The Principality of Thomond and His Royal Highness Raymond Moulton Seághan O'Brien, 1936-1963; Ireland's greatest diplomatic force | De Wiel, Jérôme aan | Article in Journal | | 2007 |
| The prison writing of Michael Davitt | O'Brien, Sean T. | Article in Journal | | 2010 |
| The prisoner's wife and the soldier's whore : female punishment in Irish history and culture | Cullingford, Elizabeth Butler | Article in Book | | 2004 |
| The production of silver in late-Georgian Dublin | FitzGerald, Alison,O'Brien, Conor, 1933- | Article in Journal | | 2001 |
| The question of Irish identity in the writings of William Butler Yeats and James Joyce | O'Brien, Eugene | Monograph or Collective Volume | Edwin Mellen Press | 1998 |
| The quiet revolution : the electrification of rural Ireland, 1946-1976 | Shiel, Michael J. | Monograph or Collective Volume | O'Brien Press|Tycooly International Publishing | 1984 |
| The rake's progress of a syndicalist : The political career of William O'Brien, Irish labour leader | Lysaght, D. R. O'Connor | Article in Journal | | 1983 |
| The rakes' progress of a syndicalist : the political career of William O'Brien, Irish labour leader | O'Connor Lysaght, D. R. | Article in Journal | | 1983 |
| The real Ireland : the evolution of Ireland in documentary film | O'Brien, Harvey | Monograph or Collective Volume | Manchester University Press | 2004 |
| The rebel in his family : selected papers of William Smith O'Brien | Davis, MarianneDavis, Richard | Monograph or Collective Volume | Cork University Press | 1998 |
| The record of sergeant William Murphy | O'Brien, Michael J. | Article in Journal | | 1925 |
| The record of the first Dáil debates | O'Brien, Gerard | Article in Journal | | 1993 |
| The reluctant rebel : William Smith O'Brien | Davis, Richard | Article in Journal | | 1998 |
| The Reminiscences of Ignatius O'Brien, Lord Chancellor of Ireland, 1913-18: A Life in Cork, Dublin and Westminster | | Monograph or Collective Volume | Four Courts | 2021 |
| The reminiscences of the Right Hon. Lord O'Brien (of Kilfenora), lord chief justice of Ireland. Edited by his daughter . | | Monograph or Collective Volume | | 1916 |
| The republicanism of Fine Gael as evidenced in the Dáil Éireann parliamentary debates, 1936-1948 | O'Brien, Emma | Thesis | | 1999 |
| The revolutionary aims of Ireland's forgotten diplomats, 1919-1922 | O'Brien, Ann Marie | Article in Journal | | 2020 |
| The richest commoner in Clare : Sir Donough O'Brien of Lemenagh and Dromoland, baronet (1642-1717) | Ó Murchadha, Ciarán | Article in Journal | | 1991 |
| The riddle of Erskine Childers | McInerney, Michael | Monograph or Collective Volume | O'Brien | 1971 |
| The rise of the Dál Cais | Kelleher, J. V. | Article in Book | | 1967 |
| The rise of the Gabhal Raghnaill | O'Byrne, Emmett | Article in Journal | | 1998 |
| The river Shannon, Lough Ree and Athlone | Delany, Ruth | Article in Book | | 1991 |
| The road from Castlebarnagh: growing up in Irish music, a memoir | O'Brien, Paddy | Monograph or Collective Volume | Orpen Press | 2012 |
| The role of the poet in Gaelic society | O'Brien, Maire Cruise | Article in Book | | 1982 |
| The role of the public intellectual | Corcoran, Mary | Article in Book | | 2015 |
| The Rose of Tralee : fifty years a-blooming | Dwyer, T. Ryle | Monograph or Collective Volume | O'Brien Press | 2009 |
| The Rotunda hospital and its founder | Browne, Alan | Article in Book | | 1978 |
| The royal boroughs, the seaport towns and royal revenue in medieval Ireland | O'Brien, A. F. | Article in Journal | | 1989 |
| The Royal College of Surgeons in Ireland : 1784-1984 | O'Brien, E. | Monograph or Collective Volume | Eason | 1983 |
| The royal O'Briens : a tribute | O'Brien Clan Association | Monograph or Collective Volume | O'Brien Clan Association | 1992 |
| The Royal visit | O'Brien, Pat | Article in Journal | | 1997 |
| The Sack of Cashel 1647 | Swift,Dave | Article in Journal | | 2023 |
| The same age as the state | Mhac an tSaoi, Máire | Monograph or Collective Volume | O'Brien Press | 2003 |
| The school on the green : Streamstown national school | | Monograph or Collective Volume | Streamstown National School | 2002 |
| The second century of Labour | Gilmore, Eamon | Article in Book | | 2012 |
| The security forces, 1969-85 | Banyard, P. J. | Article in Book | | 1985 |
| The settlement of Imokilly and the formation and descent of the manor of Inchiquin, Co. Cork | O'Brien, A. F. | Article in Journal | | 1982 |
| The shaping of modern Ireland | | Monograph or Collective Volume | Routledge & Kegan Paul | 1960 |
| The siege : its history and legacy 1688-1889 | Fraser, T. G. | Article in Book | | 1999 |
| The significance of urban waterfronts | Martire, Agustina | Article in Book | | 2012 |
| The Sisters of Mercy Ennis | O'Brien, Pius | Monograph or Collective Volume | Congregation of the Sisters of Mercy | 1992 |
| The Sisters of Mercy in Mallow | O'Brien, Margaret | Article in Journal | | 2008 |
| The Sisters of Mercy of Birr and Nenagh | O'Brien, Sister Pius | Monograph or Collective Volume | Congregation of the Sisters of Mercy, Killaloe Mercy Generalate | 1994 |
| The Sisters of Mercy of Kilrush and Kilkee | O'Brien, Pius | Monograph or Collective Volume | Congregation of the Sisters of Mercy | 1997 |
| The Skellig story : ancient monastic outpost | Lavelle, Des | Monograph or Collective Volume | O'Brien Press | 1993 |
| The Skibbereen Skellig list | O'Brien, GeraldUngoed-Thomas, JasperVickery, Richard | Article in Journal | | 2016 |
| The slump and new frontiers : Irish-Catholic migration to interwar Britain | O'Brien, Matthew | Article in Book | | 2010 |
| The soldiers houses in Limerick: the story of the Irish Sailors and Soldiers Land Trust | O'Brien, Anthony | Article in Journal | | 1998 |
| The sporting tradition | Redmond, Garry | Article in Book | | 1979 |
| The stars are our only warmth: Alice Leahy, a memoir | Cleary, CatherineLeahy, Alice | Monograph or Collective Volume | The O'Brien Press | 2018 |
| The state in transition : essays in honour of John Horgan | | Monograph or Collective Volume | New Island | 2015 |
| The stolen village : Baltimore and the Barbary pirates | Ekin, Des | Monograph or Collective Volume | O'Brien Press | 2006 |
| The stone that 'smashed the van' | Joye, Lar | Article in Journal | | 2017 |
| The story of Máire Ruadh | Hanley, Mary | Article in Journal | | 1991 |
| The story of St Peter's Port, Athlone | O'Brien, Gearoid | Article in Journal | | 1996 |
| The story of the Concannons | O'Brien, Maureen Concannon | Monograph or Collective Volume | Clan Publications | 1989 |
| The story of the O'Briens of Bandon and their descendants, 1875-2013 | Hyland, Áine | Monograph or Collective Volume | The author | 2013 |
| The story of the Poor Clares | O'Brien, Celsus | Monograph or Collective Volume | Franciscan Friary | 1992 |
| The strange death of the Irish language, 1780-1800 | O'Brien, Gerard | Article in Book | | 1989 |
| The submarine : Ireland's part in its evolution and history | O'Brien-Twohig, A. J. | Article in Journal | | 1942 |
| The survivor | O'Brien, Alfie | Article in Journal | | 2002 |
| The tenants' movement to capture the Irish Poor Law Boards, 1877-1886 | Feingold, W. L. | Article in Journal | | 1975 |
| The territorial ambitions of Maurice FitzThomas, first earl of Desmond, with particular reference to the barony and manor of Inchiquin, co. Cork | O'Brien, A. F. | Article in Journal | | 1982 |
| The Tholsel of Athlone | O'Brien, Brendan | Article in Journal | | 1973 |
| The three lives of Gavan Duffy | Pearl, C. | Monograph or Collective Volume | O'Brien Press|New South Wales University Press | 1979 |
| The time has come : Ger McDonnell, his life and his death on K2 | O'Brien, Damien | Monograph or Collective Volume | Collins | 2012 |
| The Times versus William Smith O'Brien | Touhill, Blanche M. | Article in Journal | | 1982 |
| The Tinsley portrait sketches of the Wiliam Smith O'Brien trial | Forbes, J. D. | Article in Journal | | 1953 |
| The tithe war 1831-1838 | O'Brien, Seán | Article in Journal | | 1993 |
| The town hall and market house, Wicklow | O'Brien, Andrew | Article in Journal | | 2002 |
| The town walls and fortifications | Walsh, Paul | Article in Book | | 2004 |
| The turbulent life of Dean Morgan O'Brien | O'Donnell, Tom | Monograph or Collective Volume | Carraig Point | 2009 |
| The turret or belvedere of Dromoland | O'Brien, Grania R. | Article in Journal | | 1995 |
| The Uí Briain kingship in Telach Óc | Hogan, James | Article in Book | | 1995 |
| The UN special representative's view | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 2005 |
| The unimportance of public opinion in eighteenth-century Britain and Ireland | O'Brien, Gerard | Article in Journal | | 1993 |
| The union and the economic future of Northern Ireland | McCarthy, Robert E. | Article in Book | | 1998 |
| The Unionjacking of Ireland | O'Brien, Jack | Monograph or Collective Volume | Mercier Press | 1993 |
| The United Irish League in Drogheda from minute books 1900-1901 | Fleming, Edward | Article in Journal | | 2011 |
| The United Irish League. First Public Meeting in Westport 120 years ago | Clarke, Aiden | Article in Journal | | 2018 |
| The United States torpedo-boat O'Brien | Anonymous | Article in Journal | | 1900 |
| The university in a divided society | Fraser, Thomas G. | Article in Book | | 2009 |
| The University of Ulster : genesis & growth | | Monograph or Collective Volume | Four Courts | 2009 |
| The use of brick in Ireland | O'Brien, Elena | Article in Journal | | 2009 |
| The validity of colonial Irish American history : the case of Michael J. O'Brien | Eid, Leroy V. | Monograph or Collective Volume | Northeastern University Press | 1990 |
| The valley of the kings : the Boyne : five thousand years of history | Boylan, Henry | Monograph or Collective Volume | O'Brien Press | 1988 |
| The vanishing Irish | | Monograph or Collective Volume | [s.n.] | 1954 |
| The village of longing : an Irish boyhood in the fifties | O'Brien, George, 1945- | Monograph or Collective Volume | Lilliput Press | 1987 |
| The Visitors' Book | O'Brien, Grania R. | Article in Journal | | 2009 |
| The voice of the people : songs and history of Ireland | Mulcahy, Michael | Monograph or Collective Volume | O'Brien Press | 1982 |
| The Volunteers of Dublin, 1778-84 : a short study of urban volunteering | O'Connor, Stephen | Article in Book | | 2008 |
| The wars of Turlogh : an historical document | Curtis, Edmund, 1881-1943 | Article in Journal | | 1913 |
| The way we were | O'Brien, Miriam Hederman | Article in Book | | 2000 |
| The weight of compassion and other essays | O'Brien, Eoin | Monograph or Collective Volume | Lilliput | 2012 |
| The whiskeys of Ireland | Mulryan, Peter | Monograph or Collective Volume | O'Brien Press | 2002 |
| The will of the 8th earl of Thomond | O'Brien, Ivor | Article in Journal | | 1988 |
| The windows of St Peter's | O'Brien, Seamus | Article in Journal | | 2012 |
| The Worker : James Connolly's 'organ of the Irish working class' | Curry, James | Article in Book | | 2014 |
| The young Yeats | Davie, Donald | Article in Book | | 1960 |
| The “O'Brien ethic” as an interpretative problem | Regan, John M. | Article in Journal | | 2013 |
| These my friends and forebears : the O'Briens of Dromoland | O'Brien, G. R. (Grania Rachel), 1928- | Monograph or Collective Volume | Ballinakella | 1991 |
| They once trod the boards in Athlone | O'Brien, Brendan | Article in Journal | | 1978 |
| Thomas F. Feigh : philanthropist extraordinary | O'Brien-Grennan, Cathleen | Article in Journal | | 1993 |
| Thomas Kettle and Francis Sheehy-Skeffington | McHugh, Roger Joseph | Article in Book | | 1960 |
| Thomas W. Rolleston (1857-1920), 'an educated Englishman who thinks he's an Irishman' | O'Brien, Mary | Thesis | | 2004 |
| Thomas William Rolleston : the forgotten man | O'Brien, Maria | Article in Book | | 2004 |
| Three remarkable families | Fullam, Paddy | Article in Journal | | 1983 |
| Timothy Healy : Memories and Anecdotes | Barton, Dunbar Plunket, Sir | Monograph or Collective Volume | | 1933 |
| Timothy Michael Healy | O'Brien, Conor Cruise, 1917-2008 | Article in Book | | 1960 |
| Timothy O'Brien, an early Irish immigrant | O'Brien, Michael J. | Article in Journal | | 1926 |
| Tinkers and travellers | Gmelch, Sharon | Monograph or Collective Volume | O'Brien Press | 1975 |
| Tír Eoghain "north of the mountain" | Simms, Katharine | Article in Book | | 1999 |
| To Katanga and back : a U.N. case history | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | [s.n.] | 1962 |
| To laugh or to weep : a biography of Conor Cruise O'Brien | Jordan, Anthony J. | Monograph or Collective Volume | Blackwater | 1994 |
| To school through the highways and bye-ways of Streamstown during the last century | Stokes, Peter | Article in Book | | 2002 |
| To Shorten the Road | Gmelch, George (Essays and Biographies) | Monograph or Collective Volume | The O'Brien Press | 1978 |
| Tom Grehan : advertising pioneer and newspaperman | Kenny, Colum | Article in Book | | 2012 |
| Tony Gregory | Gilligan, Robbie | Monograph or Collective Volume | O'Brien Press | 2011 |
| Toor More (Corrandhu): a bronze age hillfort in North Kilkenny | O'Brien, William | Article in Journal | | 2017 |
| Topographics of terror and taste : the re-imaging of Belfast in recent cinema | McLoone, Martin | Article in Book | | 2004 |
| Tower houses in south Clare | O'Brien, John | Article in Journal | | 1977 |
| Tracing the cultural legacy of Irish Catholicism : from Galway to Cloyne and beyond | Maher, EamonO'Brien, Eugene | Monograph or Collective Volume | Manchester University Press | 2017 |
| Tracing the imprint: Catholicism in some twentieth century Irish fiction | Maher, Eamon | Article in Journal | | 2011 |
| Trades and customs of nineteenth century | O'Brien, Patrick | Article in Journal | | 1983 |
| Traditions of the Banshee, the Irish supernatural death-messenger | Lysaght, Patricia | Article in Book | | 2009 |
| Transatlantic connections and the sharp edge of the Great Depression | O'Brien, Matthew J., 1968- | Article in Journal | | 2002 |
| Travel and accidents | O'Brien, Grania R. | Article in Journal | | 1997 |
| Travellers: Journey's end; customs around death | O'Brien, Ann | Article in Book | | 2000 |
| Travels of William Smith O'Brien in Europe and the wider world 1843 to 1864 | Davis, Richard | Monograph or Collective Volume | Geography Publications | 2013 |
| Tudor rule in Gaelic Leinster and the rise of Feagh McHugh O'Byrne | Donovan, Brian C. | Article in Journal | | 1998 |
| Two Dominican martyrs of Ireland | Fenning, HughValkenburg, Augustine | Monograph or Collective Volume | Dominican | 1992 |
| Two sixteenth century Munster primates : Donnchadh Ó Taidhg (1560-62) & Richard Creagh (1564-85) | O'Brien, W. P. | Article in Journal | | 1989 |
| Two wild nights in Ballinglen (2) the widow's roof (3) William O'Brien | Langan, Tom | Article in Journal | | 1988 |
| Uí Bhraoin na Dufaine | de Vál, Seamus S. | Article in Journal | | 2004 |
| Ullard Prebend in fifteenth-century Laighlin | O'Brien, Niall C.E.J. | Article in Journal | | 2018 |
| Ulster College to Ulster Polytechnic | McCloy, Don | Article in Book | | 2009 |
| Unblessed amongst women : performing patriarchy
without men in contemporary Irish theatre | O'Brien, Cormac | Article in Book | | 2014 |
| Uncommon valour : 1916 and the battle for the South Dublin Union | O'Brien, Paul | Monograph or Collective Volume | Mercier | 2010 |
| Unnatural law : William McGivern's rogue cops | Tracy, Tony | Article in Book | | 2009 |
| Urban Ireland : development of towns and villages | Curriculum Development Unit | Monograph or Collective Volume | O'Brien Press | 1982 |
| Views of Georgian Dublin : perspectives of the city | Stevens, Julia Anne | Article in Book | | 2008 |
| Viking Dublin exposed : the Wood Quay saga | | Monograph or Collective Volume | O'Brien Press | 1984 |
| Vincent O'Brien : the national hunt years | Fuller, Bryony | Monograph or Collective Volume | Punchestown Books | 1992 |
| Vincent O'Brien : the official biography | Herbert, IvorO'Brien, Jacqueline | Monograph or Collective Volume | Bantam Press | 2005 |
| Violence and assimilation in Tudor Ireland | Jackson, Donald | Article in Book | | 1978 |
| Viscount Berehaven’s tour of Italy in 1842–3 : collecting 'articles of taste' for Bantry House
| Boggi, Flavio | Article in Journal | | 2017 |
| Visiting the Vatican in the early 19th century : some Irish memories | O'Brien, Anne E. | Article in Journal | | 2003 |
| Voice of experience 5 : "For the first time Irish workers looked down on the city they created" | O'Brien, May | Article in Book | | 2013 |
| Voices of Ireland : conversations with Donncha Ó Dulaing | Boylan, HenryÓ Dúlaing, Donncha | Monograph or Collective Volume | O'Brien Press and RTE | 1984 |
| W. R. Rodgers (1909-1969) | O'Brien, Darcy | Monograph or Collective Volume | [s.n.] | 1970 |
| W.J. Duffy | O'Brien, Patrick | Article in Journal | | 1996 |
| War and politics in Ireland 1649-1730. | Hayton, D. W. (David William)O'Brien, GerardSimms, J. G. (John Gerald) | Monograph or Collective Volume | Hambledon | 1986 |
| War and society in Westmeath, 1689-91 | Murtagh, Harman | Article in Book | Geography Publications | 2022 |
| Waterford and Westminster Abbey | Brophy, Anthony | Article in Journal | | 2018 |
| We Go Into Action Today at Noon ...: First-hand Accounts from Ireland’s Revolutionary Years, 1913–22 | Eamonn, Duggan | Monograph or Collective Volume | O'Brien Press | 20 |
| We shall rise again | O'Brien, Nora Connolly | Monograph or Collective Volume | Mosquito | 1981 |
| Westmeath : literary 'stories-so-far' | Thompson, Mary Shine | Article in Book | Geography Publications | 2022 |
| Westmeath bardic poetry | Ó Háinle, Cathal G. | Article in Book | Geography Publications | 2022 |
| Westmeath elections, 1918-1970 | Kavanagh, Adrian ; D'Arcy, Caoilfhionn | Article in Book | Geography Publications | 2022 |
| Westmeath elections, 1970-2020 | Durkan, William | Article in Book | Geography Publications | 2022 |
| Westmeath history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 2022 |
| Westmeath's archives | Connell, Gretta | Article in Book | Geography Publications | 2022 |
| Westmeath-Argentine narratives of tradition and identity | O'Brien, Sarah | Article in Journal | | 2013 |
| Wexford apprentices in sixteenth-century Bristol | O'Brien, Niall | Article in Journal | | 2012 |
| What's in a name? Many plant species were named after Irish explorers and cultivated garden varieties carry names that commemorate notable Irish gardeners | O'Brien, Seamus | Article in Journal | | 2012 |
| Whatever happened to rates? : a study of Irish tax policy on domestic dwellings | O'Brien, Miriam Hederman | Article in Journal | | 1989 |
| Wheeling's Irish thread : an O'Brien family tale | Brennan, Margaret | Article in Journal | | 1999 |
| When the circus came to Athlone | O'Brien, Brendan | Article in Journal | | 1985 |
| Where they lived in Dublin | Cowell, John, 1912- | Monograph or Collective Volume | O'Brien Press | 1980 |
| Where was Ivernis? | Gogan, L. | Article in Book | | 1944 |
| Whose war was it anyway? Irish journalism and the Great War after 1918 | O'Brien, Mark 1973- | Article in Journal | | 2016 |
| Wicklow and District Chamber of Commerce : a history | O'Brien, Andrew | Monograph or Collective Volume | Wicklow and District Chamber of Commerce | 2002 |
| Wicklow and the Great War | O'Brien, Andrew | Article in Journal | | 2011 |
| Wicklow and the Great War - 1|Wicklow and the Great War - 2|Wicklow and the Great War - [3] -1916 | O'Brien, Andrew | Article in Journal | | 2011 |
| Wicklow boatyard. [Photographs 1890s] | Anonymous | Article in Journal | | 2007 |
| Wicklow Harbour : a history | Cleary, JimmyO'Brien, Andrew | Monograph or Collective Volume | Wicklow Harbour Commissioners | 2001 |
| Wicklow men in the Spanish American War of 1898 | O'Brien, Andrew | Article in Journal | | 2008 |
| Wicklow's Maritime Heritage ...tragedy - shipwrecks and tales of the Wicklow coastline | O'Reilly, Stan J. | Article in Journal | | 2021 |
| Wicklowmen at Trafalgar | O'Brien, Andrew | Article in Journal | | 2006 |
| Wild Irish women : extraordinary lives from history | Broderick, Marian | Monograph or Collective Volume | O'Brien | 2001 |
| Wild Irish women : extraordinary lives from history | Broderick, Marian | Monograph or Collective Volume | O'Brien Press | 2012 |
| Wild Irish women : extraordinary lives from history | Broderick, Marian | Monograph or Collective Volume | O'Brien Press | 2002 |
| William Carleton : the Lough Derg exile | O'Brien, Margaret | Article in Book | | 1991 |
| William Gosse, a merchant in fourteenth-century Waterford | O'Brien, Niall | Article in Journal | | 2011 |
| William James Pirrie | Black, R. D. C. | Article in Book | | 1960 |
| William O'Brien | Kelleher, Margaret | Article in Journal | | 1985 |
| William O'Brien : a great Irishman and a great Irish nationalist | Sheehan, D. D. (Daniel Desmond) | Article in Book | | 1942 |
| William O'Brien : problems reappraising his political career | Bull, Philip | Article in Book | | 1986 |
| William O'Brien agus a chlann | Mitchell, L. M. | Article in Journal | | 1958 |
| William O'Brien and partition | Power, Bill | Article in Journal | | 2001 |
| William O'Brien and the All for Ireland League | Schilling, F.K. | Thesis | | 1956 |
| William O'Brien and the course of Irish politics, 1881-1918 | O'Brien, J. V. | Monograph or Collective Volume | University of California Press | 1976 |
| William O'Brien and the Irish land war | Warwick-Haller, Sally | Monograph or Collective Volume | Irish Academic Press | 1990 |
| William O'Brien and the Kingston estate | Power, Bill | Article in Journal | | 1994 |
| William O'Brien and the Land War in Ireland 1877-1903 | Warwick-Haller, Sally | Thesis | | |
| William O'Brien collection : a catalogue | National Library of Ireland | Monograph or Collective Volume | National Library of Ireland | 1969 |
| William O'Brien's Canadian correspondence | Lyne, Daniel C. | Article in Journal | | 1971 |
| William O'Brien, 1881-1968 : socialist, republican, Dáil deputy, editor, and trade union leader | Morrissey, Thomas J. | Monograph or Collective Volume | Four Courts | 2007 |
| William O'Brien, 1881-1968 and the Irish labour movement | Mitchell, Arthur | Article in Journal | | 1971 |
| William O'Brien, 1903-10 | Spain, Stephen L. | Thesis | | 1962 |
| William O'Brien, M. P. : the years 1889 to 1891 | Forde, Robert | Article in Journal | | 1988 |
| William O'Brien, M.P., and the Irish Centre Party | Sheenan, Patrick | Article in Journal | | 1910 |
| William O'Brien, MP : The Metropolitan and International Dimensions of Irish Nationalism | Bull, Philip | Article in Journal | | 2009 |
| William O'Brien, MP : the metropolitan and international dimensions of Irish nationalism | Bull, Philip | Article in Journal | | 2009 |
| William O'Brien, MP : the metropolitan and international dimensions of Irish nationalism | Bull, Philip | Article in Book | | 2011 |
| William O'Brien, Mr. Balfour's prisoner | Smith, Beverly A. | Article in Journal | | 1983 |
| William of Windsor and the wars of Thomond | Harbison, Sheelagh | Article in Journal | | 1989 |
| William Paterson, 1745-1806 : lawyer and politician | Ickringill, Steve | Article in Book | | 1992 |
| William Smith O'Brien | Gwynn, D. R. (Denis Rolleston), 1893-1972 | Article in Journal | | 1946 |
| William Smith O'Brien 1803-1864 | Bugler, Paul | Article in Journal | | 2003 |
| William Smith O'Brien : Ireland 1848 - Tasmania | Davis, Richard | Monograph or Collective Volume | Geography Publications | 1989 |
| William Smith O'Brien and Cahermoyle | Fenton, Laurence | Article in Journal | | 2004 |
| William Smith O'Brien and his Irish revolutionary companions in penal exile | Touhill, Blanche M. | Monograph or Collective Volume | University of Missouri Press | 1981 |
| William Smith O'Brien and his second | De Bhaldraithe, Pádraig | Article in Journal | | 1989 |
| William Smith O'Brien and the American civil war | David, Richard | Article in Journal | | 1993 |
| William Smith O'Brien and the Young Ireland rebellion of 1848 | Sloan, Robert | Monograph or Collective Volume | Four Courts | 2000 |
| William Smith O'Brien in Van Diemen's Land | Heaney, Carmel | Article in Journal | | 1998 |
| William Smith O'Brien in Van Diemen's land 1849-1864 | Cussen, John | Article in Journal | | 1988 |
| William Smith O'Brien, 1803-1864 | Heaney, Carmel | Monograph or Collective Volume | Donatus Press | 2004 |
| William Smith O'Brien, 6th October 1803 - 18th June 1864 | O'Brien, Brendan | Article in Journal | | 1998 |
| William Smith O'Brien, an scoláire Gaeilge | Mac Peaircín, Liam, 1938-2019 | Article in Journal | | 2002 |
| William Smith O'Brien, Poor Laws and convicts | Davis, Richard P. | Article in Book | | 2011 |
| William Smith O'Brien. A plea for mercy from the people of Ireland | Duffy, Godfrey | Article in Journal | | 1994 |
| William Smith O’Brien : petitions of mercy | Duffy, Godfrey F. | Article in Journal | | 1995 |
| William Smith O’Brien as an imperialist | Davis, Richard | Article in Book | | 1995 |
| William Smith O’Brien’s secret family | Weir, Hugh W. L. | Article in Journal | | 1996 |
| Willowbrook, a flawed Eden : a memoir of growing up in Millstreet, Co. Cork | O'Brien, Jim | Monograph or Collective Volume | Aubane Historical Society | 2013 |
| Wire Ropes Ltd., Wicklow 1951 - 2001 : a commemorative souvenir | O'Brien, Andrew | Monograph or Collective Volume | Wire Ropes Ltd. | 2001 |
| With warmest love : lectures for Kate O'Brien, 1984-93 | | Monograph or Collective Volume | Mellick Press for the Kate O'Brien Weekend Committee | 1994 |
| Women and early Irish Lawn Tennis | O'Brien, John | Article in Journal | | 2024 |
| Women and Enlightenment in Eighteenth-Century Britain | O'Brien, Karen | Monograph or Collective Volume | Cambridge University Press | 2009 |
| Women in the union 2 : 'Fraternally yours' | O'Brien, Mags | Article in Book | | 2013 |
| Women of substance | O'Brien, Paul | Article in Journal | | 2014 |
| Words, written, spoken and sung | Mac Réamoinn, Seán | Article in Book | | 1979 |
| Workhouse management in pre-famine Ireland | O'Brien, Gerard | Article in Journal | | 1986 |
| Wreck of the African mail steamer 'Armenian'. From the supplement of the 'Illustrated London News', p.117, Feb 4th 1865 | O'Brien, David | Article in Journal | | 1992 |
| Writers and politics | O'Brien, Conor Cruise, 1917-2008 | Monograph or Collective Volume | [s.n.] | 1965 |
| Writers of the left : politics and culture in Ireland during the 1930s | O'Brien, Paul | Article in Book | | 2008 |
| Writing about the Irish in Australia | Reece, Bob | Article in Book | | 1991 |
| Writing from the margins : In Touch, Identity, Out and GCN | O'Brien, Mark | Article in Book | | 2021 |
| Writing Lough Derg : from William Carleton to Séamus Heaney | O'Brien, Peggy | Monograph or Collective Volume | Syracuse University Press | 2006 |
| Yeats at fifty | Foster, R. F. (Robert Fitzroy) (Roy), 1949- | Article in Book | | 1998 |
| Youghal | O'Brien, A. F. | Article in Book | | 1995 |
| Young tigers and mongrel foxes : [a life in politics] | Harte, Paddy | Monograph or Collective Volume | O'Brien Press | 2005 |
| ‘Indecent and suggestive pictorial matter’ : banning Picture Post in Ireland | O'Brien, Mark | Article in Journal | | 2023 |
| ‘It gives great relief to my mind’ - family involvement at children's committal to the Sister of Mercy run Irish industrial schools, 1868-1936 | O'Brien, Jane | Article in Journal | | 2024 |
| ‘With the Irish in France’ : the national press and recruitment in Ireland 1914-1916 | O'Brien, Mark | Article in Journal | | 2016 |
| “A fine old time” : feminist print journalism in the 1970s | O'Brien, Anne | Article in Journal | | 2017 |
| “A fine old time” : feminist print journalism in the 1970s | O'Brien, Anne | Article in Journal | | 2017 |
| “Determined Perseverance” : the Glynn family and business enterprise in Kilrush, 1811 – 1940 | O'Brien, Paul | Thesis | | 2016 |