| "A peculiar tramping people" : the Irish in Britain, 1801-1870 | Fitzpatrick, David | Article in Book | Clarendon Press | 1989 |
| "By appointment to emperors" : Marcus Ward and Company of Belfast | Dixon, Roger | Article in Book | Linen Hall Library | 1996 |
| "In the mind's eye" - Francis MacManus and Kilkenny | Nolan, William | Article in Book | Kilkenny Archaeological Society | 1997 |
| "Look at Northern Ireland'' : lessons best learned at home | Hazelton, William A. | Article in Book | University of Wisconsin Press | 2014 |
| "Masters of the mountains" : the insurgent careers of Joseph Holt and Michael Dwyer, County Wicklow, 1798-1803 | Bartlett, Thomas | Article in Book | Geography Publications | 1994 |
| "No more to be got from the cat but the skin" : management, landholding and economic change in the Murray of Broughton estate 1670-1755 | Kirkham, Graeme | Article in Book | Geography Publications | 1995 |
| "The beleaguered fortress", St Patrick's College, Thurles, 1837-1988 | O'Dwyer, Christopher | Article in Book | Geography Publications | 1989 |
| "The water was the sheriff" : the land beneath the Poulaphouca reservoir | Mac Gabhann, Fiachra | Article in Book | Geography Publications | 1994 |
| "Un point d'interrogation qui se veut écriture": Gatti's Maze | Hutchinson, Wesley | Article in Journal | | 2008 |
| ' Burned with ... turf' : The unique charm of Irish ceramics | Francis, Peter | Article in Book | Art Institute of Chicago | 2015 |
| 'A centre of turbulence and rioting' : the republican movement in Limerick, 1917-1918 | O'Callaghan, John | Article in Book | Mercier Press | 2011 |
| 'A public benefit' : Sir Vere Hunt, Bart and the town of New Birmingham, Co. Tipperary, 1800-1818 | Nolan, William | Article in Book | Geography Publications | 2004 |
| 'A wide deserted waste'? Rediscovered views of Ballyfin by William Ashford, c.1784 | Laffan, WilliamMulligan, Kevin V. | Article in Journal | | 2010 |
| 'Brother Bookbinder' and the 'book beautiful': arts and crafts books in the library | Bowe, Nicola Gordon | Article in Book | Four Courts Press | 2013 |
| 'Conditional constitutionalists' : the reaction of Fianna Fáil grass-roots to the IRA border campaign, 1956-1927 | Kelly, Stephen | Article in Book | Mercier Press | 2011 |
| 'Excavating, mapping and interrogating ancestral terrains': William J. Smyth and Ireland's geography | Nolan, William | Article in Book | | 2012 |
| 'Farewell to Fermanagh' : aspects of emigration from county Fermanagh | Fitzgerald, Patrick | Article in Book | Geography Publications | 2004 |
| 'I have treated you as an artist' : a letter from Philippe-Jacques de Loutherbourg to Jonathan Fisher | Laffan, WilliamRooney, Brendan | Article in Journal | | 2014 |
| 'Imitators of one another' : a source for George Barret | Laffan, William | Article in Journal | | 2015 |
| 'Ireland spent $1 million preventing research into Lousitania' | Kingston, William | Article in Journal | | 2015 |
| 'Let Erin remember' : a re-examination of the journal of Thomas Moore | Dowden, Wilfred S. | Article in Journal | | 1975 |
| 'Love's rock-built tower' : the Ulster tower Thiepval | Hutchinson, Wesley | Article in Book | Four Courts Press | 2007 |
| 'My dear uncle' : a letter from New York, 1789 | Patton, W. Donald | Article in Journal | | 1994 |
| 'One of our brilliant ornaments' : the death and life of Thomas Foster | Laffan, WilliamRooney, Brendan | Article in Journal | | 2004 |
| 'The Cries of Dublin' revisited: four new drawings by Hugh Douglas Hamilton | Laffan, William | Article in Journal | | 2018 |
| 'The Grove' | Wilson, William | Article in Journal | | 1979 |
| 'Title deed to America' : Union ethnic regiments in the civil war | Burton, William | Article in Journal | | 1980 |
| 'We are not yet safe, for they threaten us with more violence' : a study of the Cook Street riot, 1629 | Empey, Mark | Article in Book | NA | 2011 |
| 1821 census fragments from County Roscommon | Gacquin, William | Article in Journal | | 1998 |
| 1948/49 C.B.S. participate in concert and drill | Mannion, Willie | Article in Journal | | 2006 |
| A ' Wild Geese ' from Dundalk: General Miguel (Michael) Marmion, Spanish army | Marmion, William F.K., Chevalier | Article in Journal | | 2012 |
| A bibliography of British railway history. | Clinker, Charles RalphLee, Charles EdwardOttley, GeorgePalmer, J. E. C.Skillern, William J. | Monograph or Collective Volume | | 1983 |
| A bibliography of printed material relating to the county and county borough of Londonderry | Carson, W. H. | Monograph or Collective Volume | University Microfilms | 1969 |
| A chronicle of Limerick life | Gleeson, W. W. | Article in Journal | | 1979 |
| A Clareman in Van Diemen's land : the Tasmanian journal of William Smith O'Brien | Nolan, William | Article in Journal | | 1992 |
| A critical analysis of the decisions of the General Assembly of the Presbyterian Church in Ireland on social issues, 1921-1970 | Davison, William Eoin | Thesis | | |
| A cross for Ireland, 1658 | Carman, W. Y. | Article in Journal | | 2001 |
| A Digest of Evidence taken before Select Committees of the two Houses of Parliament, appointed to inquire into the state of Ireland, 1824-5 | Phelean, William ; O'Sullivan, Mortimer | Monograph or Collective Volume | NA | 1826 |
| A Donegal-born Covenanter Minister in South Carolina: Rev. Thomas Donnelly | Roulston, William | Article in Journal | | 2022 |
| A finding list of Sir James Ware's manuscripts | O'Sullivan, William, 1921-2000 | Article in Journal | | 1997 |
| A forgotten Kilkenny school | Phelan, W. J. | Article in Journal | | 1958 |
| A guide to the history and valuation of the coins of Great Britain and Ireland in gold, silver and copper, from the earliest period to the present time | Grueber, Herbart A.Thornburn, William Stewart | Monograph or Collective Volume | | 1905 |
| A hard local war : the British army and the guerrilla war in Cork, 1919-22 | Sheehan, William, 1968- | Monograph or Collective Volume | History Press | 2011 |
| A history of the Kildare hunt | Boulton, W. B. (William Biggs) | Monograph or Collective Volume | St Catherine Press | 1913 |
| A household account from County Roscommon, 1733-4 | Gacquin, William | Article in Book | | 2001 |
| A journal of the life, travels, sufferings and labour of love in the work of the ministry of ...W.E. | Edmundson, William, 1627-1712 | Monograph or Collective Volume | | 1715 |
| A lane less travelled | Logan, William C. | Article in Journal | | 2011 |
| A last plea for federation | Wyndham-Quin, W. T., 4th Earl of Dunraven | Article in Journal | | 1913 |
| A letter from Robert Hay, 1820 | Sweetman, William | Article in Journal | | 2004 |
| A letter to the earl of Carlisle from William Eden, Esq., on the representations of Ireland, respecting a free trade | Eden, William, 1st baron Auckland, 1744-1814 | Monograph or Collective Volume | | 1779 |
| A list of 17th-century Dublin diocesan priests | O'Riordan, W. M. | Article in Journal | | 1962 |
| A list of the priests, secular and regular, of the diocese of Dublin in the year 1697 | O'Riordan, W. M. | Article in Journal | | 1955 |
| A Marmion miscellany | Marmion, William F. K. | Monograph or Collective Volume | St Lazarus Press | 2002 |
| A merchant prince of the copper country : one immigrant's American success story | Mulligan, William H. | Article in Journal | | 2004 |
| A murder, a play, a film | Nolan, William | Article in Journal | | 1995 |
| A narrative of my professional adventures (1790-1839), Vol. 1:1790-1802 | Dillon, William Henry, SirLewis, Michael | Monograph or Collective Volume | Navy Records Society | 1953 |
| A narrative of the confinement and exile of William Steel Dickson, D.D. ... | Dickson, W. S. | Monograph or Collective Volume | | 1812 |
| A new genealogical source in 'The Boston Pilot' | O'Ryan, William D. | Article in Journal | | 1967 |
| A New History of Ireland, 4 : Eighteenth-Century Ireland | | Monograph or Collective Volume | Clarendon Press | 1986 |
| A new history of Ireland, vol. 5. Ireland under the Union, i : 1801-1870 | | Monograph or Collective Volume | Clarendon Press | 1989 |
| A new history of Ireland. Vol. 6 : Ireland under the Union, pt. 2, 1870-1921 | | Monograph or Collective Volume | Clarendon Press | 1996 |
| A portrait of the Irish in America | Griffin, William D. | Monograph or Collective Volume | Scribner | 1981 |
| A prehistory of Kerry | O'Brien, William | Article in Book | | 2020 |
| A primitive mining complex at Derrycarhoon, county Cork | O'Brien, William | Article in Journal | | 1989 |
| A second letter to the right honourable William Pitt | [Drennan, William] | Monograph or Collective Volume | | 1799 |
| A selection from the Hay correspondence | Sweetman, William | Article in Journal | | 2003 |
| A short book list on Irish, Scottish and Welsh history | Dickinson, W. C.Maxwell, C.Williams, D. | Monograph or Collective Volume | Historical Association | 1952 |
| A short history and reference guide to Kilfeacle cemetery | Ryan, William | Monograph or Collective Volume | The author | 1985 |
| A short-title catalogue of books printed in England, Scotland and Ireland and of English books printed abroad, 1475-1640, vols. 1-2 | | Monograph or Collective Volume | | 1976 |
| A snapshot of life in Harold's Cross Cottages, 1884-1940 | Hofman, Wemmechien | Article in Journal | | 2016 |
| A south Roscommon parish in the eighteenth century | Gacquin, William | Article in Journal | | 1990 |
| A statistical account or parochial survey of Ireland drawn up from the communications of the clergy. 3 vols. | Mason, W. S. | Monograph or Collective Volume | | 1814 |
| A treatise on the Supreme Court of Judicature Act (Ireland), 1877 ... | Ferguson, G. N.Ferguson, W. D. | Monograph or Collective Volume | | 1878 |
| A true narrative of the rise and progress of the presbyterian church in Ireland (1623-70). Also ... The History of the Church in Ireland since the Scots were neutralized, by A. Stewart | Adair, PatrickKillen, W. D. | Monograph or Collective Volume | | 1866 |
| A Victorian atheist encounters Roman-Catholic Ireland | Armstein, Walter L. | Article in Book | | 2005 |
| A Waterford origin for the 'Codex Salmanticensis' | O'Sullivan, William, 1921-2000 | Article in Journal | | 1998 |
| A Wexford ship-builder | Sweetman, William | Article in Journal | | 1978 |
| A window into Clogher Church of Ireland diocese : the visitations of 1622 and 1733 | Roulston, WilliamScott, Brendan | Article in Book | | 2017 |
| Abbey Leix : an Irish home and its demesne | Laffan, William | Monograph or Collective Volume | Churchill House Press | 2017 |
| Abercorn : the Hamiltons of Barons Court | Roulston, William | Monograph or Collective Volume | Ulster Historical Foundation | 2014 |
| Abstract of the first report of the commissioners on religious and other instruction in Ireland | Hamilton, W. T. | Monograph or Collective Volume | | 1835 |
| Accommodating clergymen : Church of Ireland ministers and their houses in the north of Ireland, c. 1600-1870 | Roulston, William J. | Article in Book | | 2006 |
| Accommodating the 'graces of sculpture': drawings by Giovanni Battista Cipriani for the attic statuary of the Casino at Marino | Laffan, WilliamMulligan, Kevin V. | Article in Journal | | 2013 |
| Additional medieval Meath manuscripts | O'Sullivan, William, 1921-2000 | Article in Journal | | 1987 |
| Agriculture output, rents and wages in Ireland, 1850-1880 | Vaughan, W. E. | Article in Book | | 1980 |
| All in a day's work : memories from the farm over 75 years | McGeown, William | Article in Journal | | 1998 |
| Allies in the promised land : reflections on the Irish and the Jews in the East End | Fishman, William J. | Article in Book | | 1997 |
| Almost the same stories : narrative patterns in EU treaty referendums | Schunemann, Wolf J. | Article in Journal | | 2017 |
| Altar tomb and the prehistory of Mizen | O'Brien, William | Article in Journal | | 1993 |
| An admonition to the nobility and people of England and Ireland, concerning the present warres ... | Allen, William, cardinal, 1532-1594 | Monograph or Collective Volume | | 1588 |
| An agreement to build a new church in Arboe parish in 1710 | Roulston, William J. | Article in Journal | | 2002 |
| An army with banners : the real face of Orangeism | Brown, William | Monograph or Collective Volume | Beyond the Pale Publications | 2003 |
| An assessment of the economic performance of Irish landlords, 1851-81 | Vaughan, W. E. | Article in Book | | 1980 |
| An element of electoral politics intruded into his life | Vaughan, W.E. | Article in Book | | 2008 |
| An essay on Irish swearing | Carleton, William | Monograph or Collective Volume | Trashface | 2008 |
| An Irish 'cisiojanus' | O'Sullivan, William, 1921-2000 | Article in Journal | | 1987 |
| An Irish boyhood | Magan, William | Monograph or Collective Volume | Pentland Press | 1996 |
| An olive branch in Ireland and its history | O'Brien, William | Monograph or Collective Volume | | 1910 |
| An uncommon bookman : essays in memory of J.R.R. Adams | | Monograph or Collective Volume | Linen Hall Library | 1996 |
| An unrecorded Belfast edition of John Taylor's Verbum sepiternum | McCann, Wesley | Article in Journal | | 1989 |
| Andrew Elder (1821-86) Castlefin: Campaigner for Land Reform | Roulston, William | Article in Journal | | 2020 |
| Anglica, Hibernica, Normannica, Cambrica, a veteribus scripta | Camden, William, 1551-1623 | Monograph or Collective Volume | Impensis C. Marnij, & hæredum I. Aubrij | 1602 |
| Anglican churches in Clogher diocese in the early eighteenth century | Roulston, William J. | Article in Journal | | 2011 |
| Antiquarian, academic or practical? Geologic knowledge in nineteenth-century Ireland | Mulligan, William H. | Article in Book | | 2016 |
| Ar thóir na Gaeilge : tionscadal lamhscríbhinní an Philo-Celtic Society (Bostún) 1873-1893 | Mahon, William | Article in Book | | 2015 |
| 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 |
| Archbishop Richard Whately, 1787-1863 | Watson, W. L. R. | Article in Journal | | 1963 |
| Archbishop Ussher quotes Taliesin | Hudson, Wilson M. | Article in Journal | | 1950 |
| Armagh : history & society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 2001 |
| Asgard : the story of Irish sail training | Healy, EricNixon, W. M. | Monograph or Collective Volume | Coiste an Asgard | 2000 |
| Aspects of 'Fulacht Fiadh' function and chronology in Cork | O'Brien, William | Article in Journal | | 2012 |
| At the anvil: essays in honour of William J. Smyth | | Monograph or Collective Volume | | 2012 |
| Athlone grave stones | Quinn, William | Article in Journal | | 1942 |
| Authentic and impartial memoirs of her late Majesty, Charlotte, Queen of Great Britain and Ireland | Oulton, W. C. | Monograph or Collective Volume | | 1819 |
| Ballads and poems of the County Kildare | Coghlan, W. E. | Article in Journal | | 1908 |
| Behind the gorgeous mask : Hugh Douglas Hamilton's 'Cries of Dublin' rediscovered | Laffan, William | Article in Book | | 2003 |
| Beresford Terrace centenary year | Atkinson, William John | Article in Journal | | 1996 |
| Bernard Sheridan - a man of steel | Mulligan, William, 1877-1968 | Article in Journal | | 2006 |
| Betrayal in Ireland : an eye-witness record of the tragic and terrible years of revolution and civil war in Ireland, 1916-24 | Irwin, Wilmot | Monograph or Collective Volume | Northern Whig | 1970 |
| Between the mountains and the gantries | Morrison, Will, 1933- | Monograph or Collective Volume | Appletree | 2006 |
| Bibliotheca Hibernicana : or, A descriptive catalogue of a select Irish library, collected for the Right Hon. Robert Peel | [Mason, W. S.] | Monograph or Collective Volume | | 1823 |
| Bibliotheca Hibernicana, or a descriptive catalogue of a select Irish library | Mason, William Shaw | Monograph or Collective Volume | Irish University Press | 1970 |
| Binding memories of Trinity library | O'Sullivan, William, 1921-2000 | Article in Book | | 1992 |
| Biographer of a bishop : Alexander Clogie, 1614-1698 | Roulston, William | Article in Book | Cumann Seanchais Bhreifne | 2025 |
| Bishop Hay and Patrick Wogan | Anderson, W. J. | Article in Journal | | 1967 |
| Blessed Oliver and the Benedictines | Phillipson, Wulstan | Article in Book | | 1937 |
| Boulder-burials : a later bronze age megalith tradition in south-west Ireland | O'Brien, William | Article in Journal | | 1992 |
| Brevet generals of Irish birth in the US civil war | Marmion, William F. K. | Article in Journal | | 1997 |
| Brian Ó Fearghail - poet scribe, and farmer | Gacquin, William | Article in Journal | | 2004 |
| Britain and the Americas : culture, politics and history | | Monograph or Collective Volume | ABC Clio | 2005 |
| Britannia, sive, florentissimorum regnorum Angliae, Scotiae, Hiberniae et insularum adiacentium ex intima antiquitate chorographica descripto | Camden, William, 1551-1623 | Monograph or Collective Volume | | 1586 |
| Britannia; a chorographical description of the flourishing kingdoms of England, Scotland and Ireland ... from the earliest antiquity | Camden, William, 1551-1623Gough, Richard | Monograph or Collective Volume | | 1806 |
| British Parliamentary Papers and the local historian and genealogist | Roulston, William J. | Article in Journal | | 2002 |
| British voices from the Irish war of independence, 1918-1921 : the words of British servicemen who were there | Sheehan, William, 1968- | Monograph or Collective Volume | Collins Press | 2005 |
| 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 |
| Brother of the More Famous Ben : The Theology of Archbishop John Hoadly | Gibson, William T. | Article in Journal | | 2006 |
| Brothers Divided | Sweetman, William | Monograph or Collective Volume | The Pike Press | 2019 |
| Building new lives, maintaining old identities: Irish Associations in Michigan's Copper Country, 1860-1900 | Mulligan, William H., Jr | Article in Journal | | 2015 |
| Buildings of interest in Ballymacarrett | Smythe, WilliamThompson, Wesley | Article in Journal | | 1981 |
| Calendar of the Carew manuscripts preserved in the archiepiscopal library at Lambeth, 1515-1624 | Great Britain, Public Record Office | Monograph or Collective Volume | Longman | 1873 |
| Calendar of the Carew manuscripts preserved in the archiepiscopal library at Lambeth. 6 vols. | | Monograph or Collective Volume | | 1867 |
| Carlow associations with 'the battle of the pound' | Nolan, William | Article in Journal | | 1970 |
| Carrickfergus visited in 1635 | Brereton, William, Sir, 1604-1661Hawkins, Edward, 1780-1867 | Article in Journal | | 1988 |
| Cashel & Emly heritage | Skehan, Walter G. | Monograph or Collective Volume | Abbey Books | 1993 |
| Casimir Dunin Markiewicz, painter and playwright | Ryan-Smolin, Wanda | Article in Journal | | 1995 |
| Castlecomer | Nolan, William | Article in Book | | 1994 |
| Castles, churches and country houses : the lost architecture of county Fermanagh in an age of improvement, c.1700-c.1750 | Roulston, William J. | Article in Book | | 2004 |
| Catalogue of Irish manuscripts in Villanova University, Pennsylvania | Mahon, William | Monograph or Collective Volume | School of Celtic Studies, Dublin Institute for Advanced Studies | 2007 |
| Cathedrals in Britain and Ireland : from early times to the reign of Henry VIII | Anderson, W.Hicks, C. | Monograph or Collective Volume | MacDonald and Jones | 1978 |
| Catherine Hayes | Gleeson, W. W. | Article in Journal | | 1985 |
| Caxton's Golden Legend version | | Article in Book | | 2002 |
| Celtic Danvers | Sullivan, William B. | Article in Journal | | 1913 |
| Charles Gavan Duffy, The Nation, Irish Confederation and the Rising of 1848 | Nolan, William | Article in Book | | 2017 |
| Charles Macklin : an actor's life | Appleton, W. W. | Monograph or Collective Volume | Harvard University Press | 1961 |
| Chevalier William F. K. Marmion follows the fate of two Marmion cousins who emigrated from county Down in the early 1800s | Marmion, William F.K. | Article in Journal | | 2010 |
| Christmas on the Galtees | O'Brien, William | Monograph or Collective Volume | L. Cusack | 2010 |
| Christopher P. Monkhouse (1947-2021): a tribute | Laffan, William | Article in Journal | | 2020 |
| Church and state in Angevin Ireland | Warren, Wilfred Lewis, 1929- | Article in Journal | | 1999 |
| Church and state in Angevin Ireland | Warren, Wilfred Lewis, 1929- | Article in Journal | | 1997 |
| Church control over the grammar schools in Ireland c. 1540-1714 | Ferguson, W. S. | Article in Journal | | 1946 |
| Church of the Assumption, Callan | Dalton, William,Purcell, William | Article in Book | | 2010 |
| Ciothruadh's Yellow Book of Lecan | O'Sullivan, William, 1921-2000 | Article in Journal | | 1981 |
| Civic institutions in Cork | O'Sullivan, William, 1908-1992 | Article in Journal | | 1943 |
| Clashanimud Hillfort and Bronze Age warfare in Cork | O'Brien, William | Article in Journal | | 2014 |
| Clochán na Marabhán (Ballon Hill) | Nolan, William | Article in Journal | | 1968 |
| Clonmel's military barracks | Bergin, W. J. | Article in Journal | | 1983 |
| Commodore John Barry | Griffin, William L. J. | Article in Journal | | 1923 |
| Completing the ethnic mosaic : Irish miners in the Upper Peninsula | Mulligan, William H. | Article in Journal | | 2004 |
| Cork's early buses : the story of Southern Motorways and its times | Swanton, W. A. | Monograph or Collective Volume | William Swanton | 1992 |
| Cornelius Harnett : "the pride of Cape Fear" | Hannon, W. B. | Article in Journal | | 1911 |
| Correspondence of David Rothe and James Ussher 1619-23 | O'Sullivan, William, 1921-2000 | Article in Journal | | 1994 |
| Countdown of violence : the Charlestown convent riot of 1834 | Bisson, Wilfred J. | Monograph or Collective Volume | Garland | 1989 |
| County Carlow 1641-1660 : geography, landownership and society | Nolan, William | Article in Book | | 2008 |
| County Donegal and the congested districts board, 1891-1909 | Logan, William J.P. | Thesis | | 1976 |
| County map of Carlow | Allen, W. | Monograph or Collective Volume | | 1798 |
| County Wexford trials of 1798 | Sweetman, William | Monograph or Collective Volume | The Pike Press | 2013 |
| Crossing the circle at the holy wells of Ireland | Brenneman, Mary G.Brenneman, Walter L., jr. | Monograph or Collective Volume | University Press of Virginia | 1995 |
| Cultivating a Love for Knowledge: Two hundred Years of the Belfast Natural History and Philosophical Society, 1821-2021 | | Monograph or Collective Volume | Belfast Natural History and Philosophical Society | 2023 |
| Cyril Ehrlich : before The piano | Elkan, WalterRoberts, Andrew Dunlop | Article in Book | | 2000 |
| Decade of centenaries: the story of a World War I medal | Gacquin, William | Article in Journal | | 2019 |
| Decade of centenaries: the tragic death of Peter Barrett 1901-1923 | Gacquin, William | Article in Journal | | 2019 |
| Denise's Story: W.B.Yeats, Dorothy Wellesley and the remaking of "Stories of Michael Robartes and his friends: an extract from a record made by his pupils" | Chapman, Wayne K. | Article in Journal | | 2013 |
| Derrycarhoon: a bronze age copper mine in West Cork | Hogan, NickO'Brien, William | Article in Journal | | 2012 |
| Devoy's post bag, 1871-1928. Vol. 1, 1871-80; vol. 2, 1880-1928 | | Monograph or Collective Volume | Fallon | 1953 |
| Diary of an English sea captain, 1646 | Penn, William | Article in Book | | 1998 |
| Dickens and O'Connell | Carlton, W. J. | Article in Journal | | 1945 |
| Domestic architecture in Ireland, 1640-1740 | Roulston, William J. | Article in Book | | 2007 |
| Donegal : history & society. Interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 1995 |
| Dr. Henry Montgomery, 1788-1865 - man of courage | McMillan, William | Article in Journal | | 1976 |
| Dragons from the north : Norwegian silver around 1900 including an article on the neoceltic art in Ireland | | Monograph or Collective Volume | West Norway Museum of Applied Art | 1995 |
| Dublin : history and society. Interdisciplinary essays on the history of an Irish county | NA | Monograph or Collective Volume | NA | 1992 |
| Dublin lock-out 1913 | Moran, William | Article in Journal | | 1973 |
| Dublin surgeon-anatomists and other essays | Doolin, WilliamLyons, J. B. (John Benignus) | Monograph or Collective Volume | [s.n.] | 1987 |
| Dublin surgery 100 years ago | Doolin, William | Article in Journal | | 1949 |
| Dublin's surgeon-anatomists and other essays : a centenary tribute | Doolin, WilliamLyons, J. B. (John Benignus) | Monograph or Collective Volume | | 1987 |
| Early Celtic among the Indo-European dialects | Lehmann, Winfred P. | Article in Journal | | 1997 |
| Early industries in Killarney | Larner, JimO'Brien, William | Article in Book | | 2005 |
| Early Irish golf : the first courses, clubs and pioneers | Gibson, William H. | Monograph or Collective Volume | Oak Leaf Publications | 1988 |
| Early Irish influences in Scotland | Watson, William John, 1865-1948 | Article in Journal | | 1939 |
| Early metalworking and myth on the lakes of Killarney | O'Brien, William | Article in Book | | 2003 |
| Edmund Burke as an Irishman | O'Brien, William | Monograph or Collective Volume | | 1924 |
| Edward Hay | Sweetman, William | Article in Journal | | 1984 |
| Edward Lhuyd's collection of Irish manuscripts | O'Sullivan, AnneO'Sullivan, William, 1921-2000 | Article in Journal | | 1962 |
| English versions | Barron, W. R. J. | Article in Book | University of Exeter Press | 2002 |
| Eriugena : East and West : papers of the Eighth International Colloquium of the Society for the Promotion of Eriugenian Studies, Chicago and Notre Dame, 18-20 October 1991 | | Monograph or Collective Volume | University of Notre Dame Press | 1994 |
| Eskerbaun, County Roscommon | Gacquin, William | Article in Book | | 1998 |
| Essay on the natural advantages of Ireland | Preston, William | Article in Journal | | 1803 |
| Estates and large farms in County Longford, 1841-1911 | Nolan, William | Article in Book | | 2010 |
| Ethnicity and nation-building : comparative, international and historical perspectives | | Monograph or Collective Volume | Sage | 1974 |
| European postcoloniality : The Saorstát Éireann / Irish Free State Official Handbook, 1932 | Harrison, William M. | Article in Journal | | 1995 |
| Events in Carlow 1916-1921 | Nolan, William | Article in Journal | | 2018 |
| Events in Carlow 1920-1921 | Nolan, William | Article in Journal | | 1970 |
| 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 |
| Exemplar Hiberniae : 100 years of local government in County Wexford | | Monograph or Collective Volume | Institute of Public Administration | 1999 |
| Exhibiting art in Georgian Ireland : The Society of Artists' exhibitions recreated | NA | Monograph or Collective Volume | Irish Georgian Society | 2018 |
| Exploring diaspora space : entangled Irish English genealogies | Bronwen, Walter | Article in Book | | 2005 |
| Extracts from the minutes of the corporation of Fethard, Co. Tipperary | Skehan, Walter G. | Article in Journal | | 1976 |
| Farmer, grazier and gentleman : Edward Delany of Woodtown, 1851-99 | Vaughan, W. E. | Article in Journal | | 1982 |
| Fassadinin : land, settlement and society in south-east Ireland, 1600-1850 | Nolan, William | Monograph or Collective Volume | Geography Publications | 1979 |
| Fermanagh : history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 2004 |
| Ferrybank church : the bishops and the Barrons | Dalton, William | Article in Book | | 2001 |
| Fiddles, flutes, drums and fifes | Drennan, Willie | Article in Journal | | 2013 |
| Field-work in place-name research | Nicolaisen, Wilhelm Fritz Hermann | Article in Journal | | 1961 |
| Fighting for Dublin : the British battle for Dublin, 1919-1921 | Sheehan, William, 1968- | Monograph or Collective Volume | Collins Press | 2007 |
| Forging a better world: socialists and international politics in the early twentieth century | Mulligan, William | Article in Book | | 2012 |
| Forth the banners go : reminiscences of William O'Brien, as told to Edward MacLysaght | O'Brien, William | Monograph or Collective Volume | Three Candles | 1969 |
| Fota's interior landscape | Laffan, William | Article in Journal | | 2008 |
| Foyle college : the Maynooth/Dunboyne connection | Ferguson, W. S.Roberts, Alan | Article in Journal | | 1988 |
| Foyle College : the Maynooth/Dunboyne connection | Ferguson, W. S.Roberts, Alan | Article in Journal | | 1990 |
| Free trade in land : an aspect of the Irish question | Burn, William Laurence | Article in Journal | | 1949 |
| Friars in the cathedral : the first Franciscan bishops, 1226-1261 | Thomson, W. R. | Monograph or Collective Volume | Pontifical Institute of Mediaeval Studies | 1975 |
| Friars in the cathedral : the first Franciscan bishops, 1226-1261 | Thompson, W. R. | Monograph or Collective Volume | | 1975 |
| Friarstown 'house of refuge' | Moran, William | Article in Journal | | 1961 |
| From paper to pillar : 'Miscellanea structura curiosa' and the Cumberland column | Laffan, William | Article in Book | | 2005 |
| From the Beara to the Keweenaw : the migration of Irish miners from Allihies, County Cork to the Keweenaw Peninsula, Michigan, USA, 1845-1880 | Mulligan, William H. | Article in Journal | | 2001 |
| From the Emerald Isle to the Copper Island : the Irish in the Michigan Copper Country, 1845-1920 | Mulligan, William H. | Article in Journal | | 2004 |
| From Victorian boyhood to the troubles : a Skibbereen memoir | Kingston, William | Article in Journal | | 2005 |
| Gaelic studies | Watson, William John, 1865-1948 | Article in Book | | 1937 |
| Gaelic titles and forms of address a guide in the English language | MacCarthy MórMarmion, William F. K. | Monograph or Collective Volume | Irish Genealogical Foundations | 1990 |
| Galway as a transatlantic port in the 19th century | Sanderlin, Walter S. | Article in Journal | | 1970 |
| 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 |
| General Charles O'Hara | Griffin, W. D. | Article in Journal | | 1972 |
| General James Shields, hero of the Mexican and civil wars and United States senator from three states - the French Irish brigades in the war of independence - Bishop Berkeley and his plans for a great American University | Onahan, William J. | Article in Journal | | 1910 |
| General W. A. C. Ryan, the Cuban martyr | O'Ryan, William D. | Article in Journal | | 1967 |
| Generals of Irish birth in the U.S. Civil War : the complete list. | Marmion, William F. K. | Article in Journal | | 2002 |
| George Carew's Irish maps | O'Sullivan, William, 1921-2000 | Article in Journal | | 1983 |
| Gladstone's first Irish enterprise, 1864-1870 | Comerford, R.V. (Richard Vincent) | Article in Book | Clarendon Press | 1989 |
| Glanbane Hillfort and the bronze age in Kerry | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2016 |
| Glasraige, Tóecraige and Araid : evidence from ogam | Mahon, William | Article in Journal | | 1988 |
| Grattan's Home Rule, Gladstone's, and Asquith's | O'Brien, William | Monograph or Collective Volume | Free Press | 1915 |
| Griechisches beiden Iren | Berschin, Walter | Article in Book | | 1982 |
| Guernica 1937 | Burton, William | Article in Journal | | 2017 |
| H.B. Phillips impresario : the man who brought McCormack, Kreisler and Robeson to Derry | McCann, Wesley | Monograph or Collective Volume | The Belfast Society in association with the Ulster Historical Foundation | 2001 |
| H.C.Lawlor and the Excavations at Nendrum a Century ago | Roulston, William | Article in Book | | 2023 |
| Hearts & mines : the British 5th division, Ireland, 1920-1922 | Sheehan, William, 1968- | Monograph or Collective Volume | Collins | 2009 |
| Hidden 'Celtic' Ireland : indigenous Iron Age settlements in the south-western peninsulas | O'Brien, William | Article in Book | | 2009 |
| Hillforts, warfare and society in Bronze Age Ireland | O'Brien, William, 1961-
O'Driscoll, James | Monograph or Collective Volume | Archaeopress | 2017 |
| Historic buildings, groups of buildings, areas of architectural importance in North Derry, including Limavady, Ballykelly, Castlerock, Downhill and Magilligan | Girvan, W. D. | Monograph or Collective Volume | Ulster Architectural Heritage Society | 1975 |
| Historic clocks of county Down | Carson, W. H. | Monograph or Collective Volume | Mourne Observer | 2001 |
| Historical walkabouts : exploring links | Gleeson, W. W.Kemmy, Jim | Article in Journal | | 1988 |
| Historical/cultural geography | Nolan, William | Article in Book | | 2000 |
| History and antiquities of the diocese of Ossory | Carrigan, William, 1860-1924 | Monograph or Collective Volume | [s.n.] | 1980 |
| History of Sligo, county and town ..., 3 : From 1688 to the present time | Wood-Martin, W. G. | Monograph or Collective Volume | | 1892 |
| History of Sligo, county and town, from 1688 to the present time | Wood-Martin, W. G. | Monograph or Collective Volume | | 1892 |
| History of the origin of the Irish yeomanry ... to which is added the disposition made by the late General Knox for the defence of the country in May 1799 ... | Richardson, William | Monograph or Collective Volume | | 1801 |
| Horse power in the early 1900s | Conlon, Wendy | Article in Book | | 2016 |
| How Lord Edward Street got its name | Gleeson, W. W. | Article in Journal | | 1987 |
| Howth : a centenary of sailing | Nixon, W. M. | Monograph or Collective Volume | Howth Yacht Club | 1995 |
| Hugh Williamson : historian, minister, doctor and congressman | Hannon, W. B. | Article in Journal | | 1911 |
| Hutchinson's popular and illustrated story of the nations, 3 : British Isles and America | | Monograph or Collective Volume | | 1934 |
| Ich Patricius : Die Autobiographie des Apostels der Iren | Berschin, Walter | Article in Book | | 1982 |
| Imagining Catholic Ireland : the nationalist press and the creation of national identity, 1843-1870 | O'Brien, William George | Thesis | | 2007 |
| In search of John Rothe Fitzpiers | Johnston, W. S. | Article in Journal | | 1969 |
| Indiana's ethnic regiments | Burton, William | Article in Journal | | 1980 |
| Industrial archaeology : a case study in Northern Ireland | McCutcheon, W. A. | Article in Journal | | 1983 |
| Insular palaeography : current state and problems | O'Sullivan, William, 1921-2000 | Article in Journal | | 1985 |
| Introduction | Nolan, William | Article in Book | | 1986 |
| Introduction | Mulligan, WilliamSimms, Brendan | Article in Book | | 2010 |
| Introduction | Murphy, Eileen,Roulston, William J. | Article in Book | | 2004 |
| Introduction | Gibson, William T.Ingram, Robert G. | Article in Book | | 2005 |
| Introduction | Nolan, William | Article in Book | | 1996 |
| Introduction. Colonial Ireland : artistic crossroads | Laffan, William | Article in Book | | 2015 |
| Ireland : crossroads of art and design, 1690-1840 | | Article in Book | Art Institute of Chicago; distributed by Yale University Press | 2015 |
| Ireland in the twelfth century | Warren, Wilfred Lewis, 1929- | Article in Journal | | 1962 |
| Ireland now : tales of change from the global island | Flanagan, William G. | Monograph or Collective Volume | University of Notre Dame Press | 2007 |
| Ireland, c.1870 | Vaughan, W. E. | Article in Book | | 1989 |
| Irish Brigade officers of the French army in the American Revolution | Marmion, William F. K. | Article in Journal | | 1998 |
| Irish builders in North Carolina | Hannon, W. B. | Article in Journal | | 1911 |
| Irish generals and Spanish politics under Fernando VII | Griffin, William D. | Article in Journal | | 1971 |
| Irish historical statistics : population, 1821-1971 | | Monograph or Collective Volume | Royal Irish Academy | 1978 |
| Irish houses and castles | Guinness, DesmondRyan, William | Monograph or Collective Volume | Thames & Hudson | 1971 |
| Irish immigrants in Michigan's copper country : assimilation on a northern frontier | Mulligan, William H. | Article in Journal | | 2001 |
| Irish immigrants in the early Keweenaw mines : a research note | Mulligan, William H. | Article in Journal | | 2000 |
| Irish knighthoods and related subjects : an anthology of published works | Marmion, William F. K. | Monograph or Collective Volume | Irish Genealogical Foundations | 2002 |
| Irish priests in the north-east in the eighteenth century | Nicholson, W. J. | Article in Journal | | 1984 |
| Irish priests in the north-east in the nineteenth century | Nicholson, W. J. | Article in Journal | | 1985 |
| Irish Protestant's plea for home rule | Hutcheson, William | Monograph or Collective Volume | Home Rule Council | 1912 |
| Irish recipients of awards for bravery in the United States armed forces (1863-1963) | O'Ryan, William D. | Article in Journal | | 1968 |
| Irish regiments in the Union army : the Massachusetts experience | Burton, William | Article in Journal | | 1983 |
| Irish statesman and rebel : the two lives of Eamonn de Valera | Severn, William | Monograph or Collective Volume | Washbourne | 1970 |
| Irish towns : a guide to sources | | Monograph or Collective Volume | Geography Publications | 1998 |
| Irish Towns in the Eighteenth and Nineteenth Centuries | Freeman, W. E. | Article in Book | | 1977 |
| Iroschotten in Oberhessen | Meyer-Barkhausen, W. | Article in Journal | | 1953 |
| Italy - the hard way : Paddy Cullen's war memoirs | Cullen, William, 1914x15-1967 | Monograph or Collective Volume | [D. Cullen] | 2004 |
| Iverni: A prehistory of Cork | O’Brien, William | Monograph or Collective Volume | Collins | 2012 |
| J. M. Synge and the western mind | Thornton, Weldon | Monograph or Collective Volume | [s.n.] | 1979 |
| James Anthony Froude, a biography, 1 : 1818-56; 2 : 1856-1894. 2 vols. | Dunn, W. H. | Monograph or Collective Volume | | 1961 |
| James Connolly and the Irish left | Anderson, William K. | Monograph or Collective Volume | Irish Academic Press | 1994 |
| James Mackintosh, Burke, and the cause of reform | Christian, William | Article in Journal | | 1973 |
| James McCosh: the making of a reputation : A study of the life and work of the Rev. Dr. James McCosh in Ireland from his appointment as Professor of Logic and Metaphysics in Queen's College, Belfast, 1851, to his appointment as President of Princeton College, New Jersey, and Professor of Philosophy, in 1868 | Patton, William Donald | Thesis | | |
| James Nicholson Richardson, 1846-1921 : an Ulster friend of his time and place | Chapman, W. Ross | Article in Journal | | 1997 |
| Jeremiah Fitzhenry : 'a chief who knew how to command' | Sweetman, William | Article in Journal | | 1998 |
| John Arwel Edwards' rural geography of County Louth, 1965 | Nolan, William | Article in Book | | 2023 |
| John Devoy's correspondence with Mrs. Florence D. White (Annie Kickham Cleary) concerning his biography of C.J. Kickham in 1927 | Nolan, William | Article in Journal | | 2006 |
| John Hughes and a catholic response to slavery in antebellum America | Sharron, W. B. | Article in Journal | | 1972 |
| John in Ireland, 1185 | Warren, Wilfred Lewis, 1929- | Article in Book | | 1976 |
| John Madden's manuscripts | O'Sullivan, William, 1921-2000 | Article in Book | | 2000 |
| Journal from Lima to Caracas, commencing September 4th, 1826 | Ferguson, William Owens | Article in Journal | | 2006 |
| Joyce and Yeats : Easter 1916 and the Great War | Chapman, Wayne K. | Article in Journal | | 2006 |
| Judge William Gaston : statesman and jurist | Hannon, W. B. | Article in Journal | | 1911 |
| Kildare : history and society : interdisciplinary essays on the history of an Irish county | McGrath, ThomasNolan, William | Monograph or Collective Volume | Geography Publications | 2006 |
| Kildare from the documents of conquest : the monastic extents 1540 and the civil survey 1654-1656 | Nolan, William | Article in Book | | 2006 |
| Kilkenny : History and Society : Interdisciplinary Essays on the History of an Irish County | | Monograph or Collective Volume | Geography Publications | 1990 |
| Killarney in prehistoric times | O'Brien, William | Article in Book | | 2001 |
| Kilmallock famine memorial park | Parkinson, William | Article in Journal | | 2000 |
| King John and Ireland | Warren, Wilfred Lewis, 1929- | Article in Book | | 1981 |
| King's Inns portraits | Ryan-Smolin, Wanda | Monograph or Collective Volume | Council of King's Inns | 1992 |
| Knights of St John of Jerusalem | Marmion, William F. K. | Article in Journal | | 1999 |
| Knockatreenane and the prehistoric barrows of county Cork | O'Brien, William | Article in Journal | | 2010 |
| Land and landscape in County Wicklow c.1840 | Nolan, William | Article in Book | | 1994 |
| Land purchase handbook : a popular guide to the Land Purchase Act, 1891 ... | Acason, Walter | Monograph or Collective Volume | | 1891 |
| Land reform in post-Famine Ireland | Nolan, William | Article in Book | | 2012 |
| Landed society in Knockninny, c.1660-c.1740 | Roulston, William | Article in Book | | 2019 |
| Landlord and tenant relations in Ireland between the famine and the land war 1850-1878 | Vaughan, W. E. | Article in Book | | 1977 |
| Landlord and tenant relations in Ireland, 1850-78 | Vaughan, William Edward | Thesis | | 1974 |
| Landlordism and unionism in Tyrone, 1885-1910 | Roulston, William J. | Article in Book | | 2000 |
| Landlords and tenants in Ireland 1848-1904 | Vaughan, W. E. | Monograph or Collective Volume | Economic and Social History Society of Ireland | 1984 |
| Landlords and tenants in mid-Victorian Ireland | Vaughan, W. E. | Monograph or Collective Volume | Oxford University Press | 1994 |
| Laois : history & society. Interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 1999 |
| Le gouvernement britannique et les “traditions culturelles” en Irlande du Nord. | Hutchinson, Wesley | Article in Journal | | 1995 |
| Leighlin cathedral in 1851 | Wakeman, W. F. | Article in Journal | | 1999 |
| Leo Whelan (1892-1956) | Ryan-Smolin, Wanda | Article in Journal | | 1994 |
| Letter to his excellency Lord Fitzwilliam, lord lieutenant of Ireland | [Drennan, William] | Monograph or Collective Volume | | 1795 |
| Letterkenny-born outstanding educator: Emma Saxelby | Roulston, William | Article in Journal | | 2024 |
| Letters of Orellana, an Irish helot, to the seven northern counties not represented in the national assembly of delegates held at Dublin, October 1784-1785 | [Drennan, William] | Monograph or Collective Volume | | 1785 |
| Lieutenant General Tomás O'Ryan y Vazquez | O'Ryan, William D. | Article in Journal | | 1963 |
| Life and adventures of Wilson Benson. Written by himself. | Benson, Wilson | Article in Book | [Hunter, Rose & co.] | 2015 |
| Life of John Mitchel. 2 vols. | Dillon, William | Monograph or Collective Volume | | 1888 |
| Life of the Right Honourable John Philpot Curran. 2 vols. | | Monograph or Collective Volume | | 1819 |
| Life of the Rt Hon. John Philpot Curran | Curran, W. H. | Monograph or Collective Volume | [s.n.] | 1819 |
| Lisburn's charter of 1662 | Corken, William Sinclair | Article in Journal | | 1995 |
| Lisnamanroe and the early medieval 'royal site' at Garranes, Co. Cork | Hogan, NickO'Brien, William | Article in Journal | | 2020 |
| Literary sources | Nolan, William | Article in Book | | 1998 |
| Local government and the peace process | Hazelton, William A. | Article in Book | | 1999 |
| Local worlds : early settlement landscapes and upland farming in south-west Ireland | O'Brien, William | Monograph or Collective Volume | Collins Press | 2009 |
| Longford history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 2010 |
| Lord Monck and nationality in Ireland and Canada | Morton, W. L. | Article in Journal | | 1973 |
| Lough Ennell's place in Irish history traced far back | Moran, William | Monograph or Collective Volume | Westmeath Examiner | 1953 |
| Lough Neagh : an atlas of the natural, built and cultural heritage | NA | Monograph or Collective Volume | Ulster Historical Foundation | 2022 |
| Louis MacNeice : a memorial address | Auden, W. H. | Article in Journal | | 1993 |
| Louth history and society : interdisciplinary essays on the history of an Irish county | NA | Monograph or Collective Volume | Geography Publications | 2023 |
| Making cloth in the nineteen fifties. Personal recollections of the Boyne Mill, Drogheda | Nelson, Warren | Article in Journal | | 2005 |
| Manuscripts and palaeography | O'Sullivan, William, 1921-2000 | Article in Book | | 2005 |
| Map of the county of Westmeath | Larkin, W. | Monograph or Collective Volume | | 1810 |
| Maps and views of Derry, 1600-1914 : a catalogue | Ferguson, W. S. | Monograph or Collective Volume | Royal Irish Academy | 2005 |
| Marcus Bourke - a biographical sketch | Nolan, William | Article in Journal | | 2002 |
| Marmion descents : being the noble and royal ancestors of the Marmion family of Ireland | Marmion, William F. K. | Monograph or Collective Volume | St. Lazarus press | 2005 |
| Mathias Springham, 1561-1620 | Ferguson, W. S. | Article in Journal | | 1972 |
| Mayo History and Society : Interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 2014 |
| Medieval Meath manuscripts | O'Sullivan, William, 1921-2000 | Article in Journal | | 1985 |
| Megalithic tombs, metal resources and territory in prehistoric south-west Ireland | O'Brien, William | Article in Book | | 2000 |
| Memento Mori : the seventeenth century monumental inscriptions | Roulston, William J. | Article in Journal | | 1998 |
| Memoirs of the legal, literary and political life of ... J.P. Curran, ... | O'Regan, William | Monograph or Collective Volume | | 1817 |
| Memoirs, autobiography, diaries and correspondence of Lady Morgan. 2 vols. | | Monograph or Collective Volume | | 1862 |
| Memoirs, including particulars of his adventures in various parts of Europe. A short sketch of the history of Ireland particularly as it respects the spirit of British domination in that country | Sampson, William | Monograph or Collective Volume | | 1807 |
| Memories of fifty years in the Irish woollen trade | Cronin, Willie | Article in Journal | | 1944 |
| Michael Angelo Hayes and the Scots Fusilier Guards | Carman, W. Y. | Article in Journal | | 1954 |
| Michael Collins's squad | Stapleton, William J. | Article in Journal | | 1969 |
| Michael Ford's portrait of Lord Chief Justice Henry Singleton | Fitzgerald, Desmond, Knight of GlinLaffan, William | Article in Journal | | 2006 |
| Michael Hayes - 1798 convict. Part I-II | Sweetman, William | Article in Journal | | 2013 |
| Military barracks Cahir, and military barracks Clogheen, Co. Tipperary | Bergin, W. J. | Article in Journal | | 1984 |
| Military barracks, Tipperary town | Bergin, W. J. | Article in Journal | | 1984 |
| Mills and the rural economy | Roulston, William J. | Article in Book | | 2000 |
| Mining and miners : Castlecomer 1600-1850 | Nolan, William | Article in Journal | | 1978 |
| Miscelanea Structura Curiosa | Chearnley, Samuel | Monograph or Collective Volume | Churchhill House Press | 2005 |
| Miscellanea. Law and order in early nineteenth-century Limerick | Mulligan, William P. | Article in Journal | | 2004 |
| Miscellany : Michael Doheny's description of hurling in the 1820s and 1830s | Nolan, William | Article in Journal | | 2002 |
| Mitres and mansions | Laffan, William | Article in Journal | | 2011 |
| Monaghan history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 2017 |
| Monniken, ridders en zeevaarders : opstellen over vroegmiddeleeuwst Ierse cultuur en middelnederlande letter-kunde | | Monograph or Collective Volume | Gerard Timmer, Prods | 1988 |
| Moody : the life and times of Britain's most notorious hitman | Clarkson, Wensley | Monograph or Collective Volume | Mainstream | 2003 |
| 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 |
| Murder trials in Ireland, 1836-1914 | Vaughan, W. E. | Monograph or Collective Volume | Four Courts, in association with the Irish Legal History Society | 2009 |
| My Irish journal, 1669-70 | Grubb, IsobelPenn, William | Monograph or Collective Volume | Longmans | 1952 |
| New developments in terrorist trials in Northern Ireland | Nelson, William R. | Article in Book | | 1991 |
| New fields and farms : migration policies of state land agencies, 1897-1980 | Nolan, William | Article in Book | | 1988 |
| Newman and his medical school, the fateful first lustrum, 1855-60 | Doolin, William | Article in Journal | | 1953 |
| Nixie Boran and the colliery community of north Kilkenny | Brennan, AnnaNolan, William | Article in Book | | 1990 |
| Nobiliary titles in the Republic | Marmion, William F. K. | Article in Journal | | 1995 |
| Northern Ireland : if reason fails | Kingston, William | Article in Journal | | 1973 |
| Northern Ireland : scientists and inventors | Garvin, WilbertO'Rawe, Des | Monograph or Collective Volume | Blackstaff Press | 1993 |
| Northern Ireland : the elements of a solution | Kingston, William | Article in Journal | | 1972 |
| Notes on school history : register, 1814-1834 | Ferguson, W. S. | Article in Journal | | 1941 |
| Notes on school history : school register, 1617-1814 | Ferguson, W. S. | Article in Journal | | 1939 |
| Notes on the scripts and make-up of the Book of Leinster | O'Sullivan, William, 1921-2000 | Article in Journal | | 1966 |
| O'Ryan of Mallorca | O'Ryan, William D. | Article in Journal | | 1962 |
| Obituary | Laffan, William | Article in Journal | | 2011 |
| Obituary. Michael O'Donnell (1936-2018) | Nolan, William | Article in Journal | | 2019 |
| Obituary. Rev. George Robinson, M.A. | Johnson, W.F. | Article in Journal | | 1893 |
| Obligationes pro annatis diocesis Cassellensis, [1433-1534] | | Article in Journal | | 1966 |
| Obligationes pro annatis diocesis Imelacesis, [1429-1532] | Costello, M. A.Ryan, L.Skehan, W. | Article in Journal | | 1966 |
| Observations on the famine of 1846-7, in the Highlands of Scotland and in Ireland | Alison, W. P. | Monograph or Collective Volume | | 1847 |
| Of ships and trade and Trodheim : a Norwegian connection | Ferguson, W. S.Roberts, Alan | Article in Journal | | 1987 |
| Offaly : history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 1998 |
| Oliver Goldsmith | Freeman, William | Monograph or Collective Volume | Longmans | 1952 |
| On Exhibit | Gibson, William H. | Article in Journal | | 2008 |
| On the manners and customs of the ancient Irish : a series of lectures | O'Curry, Eugene | Monograph or Collective Volume | De Búrca | 1996 |
| On the present condition of agriculture in the counties of Cork and Kerry, February 1867-, 1 report by W. R. Robertson | McClintock, AileenRobertson, W. R. | Article in Journal | | 2007 |
| On the streets of Park Slope | Geoghan, William | Article in Journal | | 1998 |
| On two documents in the Liber Decanatus I, in the Dublin diocesan archives | O'Riordan, W. M. | Article in Journal | | 1956 |
| Orientalische Einflüsse auf die insulare Kunst im Zeitalter des hl. Vergil | Mersmann, W. | Article in Book | | 1985 |
| Our good school on the hill | Wilkinson, W. R. | Monograph or Collective Volume | Jenkins | 1982 |
| Our mining past : the metal-mining heritage of Cork | O'Brien, William | Monograph or Collective Volume | Cork Public Museum | 1994 |
| P. W. Joyce and Scotland | Nicolaisen, W. F. H. | Article in Book | | 1982 |
| Painting Ireland : topographical views from Glin Castle | | Monograph or Collective Volume | Churchill House Press | 2006 |
| Paramilitary punishments and young people in west Belfast : psychological effects and implications for education | Mulholland, B.Thompson, W. | Article in Book | | 1996 |
| Paris Anderson | Phelan, W. J. | Article in Journal | | 1959 |
| Parliamentary elections in North Tyrone, 1885-1921 | Roulston, William J. | Article in Book | | 2000 |
| Parliamentary logick | Hamilton, W. G. | Monograph or Collective Volume | | 1808 |
| Parnell and the Bradlaugh case | Arnstein, Walter L. | Article in Journal | | 1963 |
| Patrick Neill and the origins of Belfast printing | McCann, Wesley | Article in Book | | 1990 |
| Patterns of living in county Tipperary from 1770 to 1850 | Nolan, William | Article in Book | | 1985 |
| Pearse as an educationalist | Glynn, W. M. | Article in Journal | | 1940 |
| Perplexingly easy : selected correspondence between William Rowan Hamilton and Peter Guthrie Tait | Hamilton, William Rowan, Sir, 1805-1865Wilkins, David | Monograph or Collective Volume | Trinity College Dublin Press | 2005 |
| Peter Robinson's settlers in Peterborough | Cameron, Wendy | Article in Book | | 1988 |
| Pieces of Irish history illustrative of the condition of the catholics of Ireland, of the origin and progress of the political system of the United Irishmen, and of their transactions with the Anglo-Irish government | MacNeven, W. J. | Monograph or Collective Volume | | 1807 |
| Pieces of Irish history, illustrative of the condition of the Catholics of Ireland, of the origin and progress of the political system of the United Irishmen; and of their transactions with the Anglo-Irish government | MacNeven, W. J. | Monograph or Collective Volume | | 1807 |
| Piet on peat : the Irish romance of Afrikaner anti-imperialism | Nasson, William Richard | Article in Book | | 2009 |
| Politics, land and rural conflict in county Waterford, c.1830-1845 | Kiely, Maurice B.Nolan, William | Article in Book | | 1992 |
| Portraits and pantheons | Laffan, William | Article in Book | | 2015 |
| Potatoes and agricultural output | Vaughan, W. E. | Article in Journal | | 1990 |
| Power politics, imperialism and national emancipation 1870-1914 | Mommen, Wolfgang J. | Article in Book | | 1978 |
| 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 |
| Prehistoric human settlement in Killarney | O'Brian, William | Article in Book | | 2005 |
| Presbyterian ministers and the Ulster rising | McMillan, William | Article in Book | | 1997 |
| Presidential address, fifty years vital statistics in Ireland | Thompson, William | Article in Journal | | 1918 |
| Printing Carton : the 2nd Duke of Leinster, Thomas Roberts and William Ashford | Laffan, WilliamRooney, Brendan | Article in Book | | 2014 |
| Puritan versus Celt, 1850-1860 | Bean, William G. | Article in Journal | | 1934 |
| Queen Victoria's other island | Arnstein, Walter L. | Article in Book | | 1998 |
| Radegundis and Brigit | Berschin, Walter | Article in Book | | 2001 |
| Radharc ar gCúl: A backward glance. Cecil Woodham-Smith's ' The Great Hunger' | Kinealy, ChristineMalcolm, ElizabethMulligan, William | Article in Journal | | 2008 |
| Railways in Ulster | Johnston, W. N. | Article in Journal | | 1980 |
| Rambles in Éireann | Bulfin, WilliamCallan, Patrick | Article in Journal | | 1982 |
| Rambles in Éirinn | Bulfin, William | Article in Journal | | 1982 |
| Raphoe Diocese: early Protestant places of worship in the 17th century | Roulston, William | Article in Journal | | 2019 |
| Reconstructing an eighteenth-century Ulster family: the Reas of Magheraknock and Killeen, County Down | Roulston, William J. | Article in Journal | | 2004 |
| Reflections on the great famine | Vaughan, W. E. | Article in Journal | | 1995 |
| Reflections on the state of Ireland in the nineteenth century, etc. | Graydon, William | Monograph or Collective Volume | | 1825 |
| Religious affiliation and the immigrant experience : Catholic Irish and Protestant highlanders in Glasgow, 1830-1850 | Sloan, William | Article in Book | | 1991 |
| Remember ’48 : Vol. 1: Young Ireland and the Rising ; Vol. 2: Young Irelanders beyond the Rising
| Nolan, William | Monograph or Collective Volume | Geography Publications | 2023 |
| Researching Belfast Jewish families, c.1850-c.1930 | McIlveen, PamelaRoulston, William J. | Article in Journal | | 2004 |
| Researching Presbyterian ancestors in Ireland | Roulston, William J. | Monograph or Collective Volume | Ulster Historical Foundation | 2020 |
| Researching Scots-Irish ancestors : the essential genealogical guide to early modern Ulster, 1600-1800 | Roulston, William J. | Monograph or Collective Volume | Ulster Historical Foundation | 2005 |
| Restoration Strabane, 1660-1714 : economy and society in provincial Ireland | Roulston, William J. | Monograph or Collective Volume | Four Courts | 2007 |
| Rev. Dr. James O'Fallon, Bishop of Elphin 1756-1786 | Gacquin, William | Article in Journal | | 1996 |
| Rev. Edmund Hogan, S.J. | Hogan, William | Article in Journal | | 1965 |
| Review article : Moyne-Templetuohy a life of its own | Nolan, William | Article in Journal | | 2003 |
| Review of Connell (K. H.), ' The population of Ireland, 1750-1845' | Burn, William Laurence | Article in Journal | | 1951 |
| Richard Griffith and the tenement valuation | Vaughan, W. E. | Article in Book | | 1980 |
| Richard Martin (1754-1834) | Pain, Wellesley | Monograph or Collective Volume | | 1925 |
| Riotous assemblies : rebels, riots and revolts in Ireland | | Monograph or Collective Volume | Mercier | 2011 |
| Rivers of Belfast : a history | O'Reilly, Des | Monograph or Collective Volume | Colourpoint | 2010 |
| Robert Andrew Boggs. An appreciation of his life and work | McLean, Winston | Article in Journal | | 2004 |
| Robert Boyd of Ballymacool | Ferguson, W. S.Roberts, Alan | Article in Journal | | 1990 |
| Robert Dawson (1589-1643), bishop of Clonfert and Kilmacduagh | Wiseman, W. G. | Article in Journal | | 1990 |
| Robert Patterson and other elderly Generals of the American Civil War | Marmion, William F.K. | Article in Journal | | 2015 |
| Roger Casement et les reliques de la République | Hutchinson, Wesley | Article in Journal | | 2001 |
| Room for books : paintings of Irish libraries | Laffan, William | Monograph or Collective Volume | Irish Georgian Society | 2016 |
| Roscommon before the famine : the parishes of Kiltoom and Cam, 1749-1845 | Gacquin, William | Monograph or Collective Volume | Irish Academic Press | 1996 |
| 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 |
| Rowing, boatracing and watermanship on the River Bann , 1842-1880 | Anderson, W. Stein | Article in Journal | | 2000 |
| Sacred ground : megalithic tombs in coastal south-west Ireland | O'Brien, William | Monograph or Collective Volume | National University of Ireland | 1999 |
| Scientia Augustiniana : studien über Augustinus, den Augustinismus und den Augustinorden : Festschrift für Adolar Zumkeller zum 60 Geburstag | Eckermann, W.Mayer, C. P. | Monograph or Collective Volume | [s.n.] | 1975 |
| Scottish and Scotch-Irish contributions to early American life and culture | Lehmann, W. C. | Monograph or Collective Volume | Kennikat Press | 1978 |
| Scottish burial and commemoration practices in seventeenth-century Ireland : the writings and memorials of William Montgomery of Rosemount | Roulston, William | Article in Journal | | 2007 |
| Scottish settlement and society in Plantation Ulster, 1610-40 | Roulston, William | Article in Book | | 2016 |
| Scottish-Irish governmental relations, 1660-90 | Ferguson, William Alexander Stewart | Thesis | | |
| Scríobhaithe Lámhscríbhinní Gaeilge i nGaillimh 1700-1900 | Mahon, William | Article in Book | | 1996 |
| Scripture politics : selections from the writings of William Steel Dickson : the most influential United Irishman of the north | Clifford, BrendanDickson, William Steel | Monograph or Collective Volume | Athol | 1991 |
| Séamus Ó Riain : an appreciation | N, W | Article in Journal | | 2007 |
| Seán Ó Neachtain’s Rabelaisian sources : a selective list | Mahon, William | Article in Book | | 2013 |
| Sean, Nua agus Síoraíocht: Féilscríbhinn in ómós do Dháithí Ó hÓgáin | | Monograph or Collective Volume | Coiscéim | 2011 |
| Selecting Peter Robinson's Irish emigrants | Cameron, W. J. | Article in Journal | | 1976 |
| Sermons on the following subjects : 1, The advantages of national repentance. 2, The ruinous effects of civil war. 3, The coming of the Son of Man. 4, The hope of meeting ... virtuous friends in a future world | Dickson, W. S. | Monograph or Collective Volume | | 1776 |
| Seventeenth century church monuments in West Ulster | Roulston, William J. | Article in Journal | | 1997 |
| Seventeenth century manors in the barony of Strabane | Roulston, William J. | Article in Book | | 2005 |
| Shaw Mason's Maghara (1814), Killelagh (1819) | Mason, William ShawMawhinney, Graham | Monograph or Collective Volume | Ballinascreen Historical Society | 2001 |
| Shipbuilding in Belfast, 1861-1986 | Geary, FrankJohnson, W. | Article in Journal | | 1989 |
| Should the Unionist party compromise on Home Rule? | Howard Gritten, W. G. | Article in Journal | | 1913 |
| Shrewd Irishmen : Irish entreprenuers and artisans in New York's clothing industry, 1830-1880 | Devlin, William E. | Article in Book | | 1996 |
| Sin, sheep and Scotsmen : John George Adair and the Derryveagh evictions 1861 | Vaughan, W. E. | Monograph or Collective Volume | Appletree Press | 1983 |
| Sir Hans Sloane, founder of the British Museum : legend and lineage | Sloan, W. R. | Monograph or Collective Volume | | 1981 |
| Sir J. C. Chatterton as colonel, 4th Royal Irish Dragoon Guards | Carman, William Y. | Article in Journal | | 1990 |
| Sligo history and society : interdisciplinary essays on the history of an Irish county | NA | Monograph or Collective Volume | Geography Publications | 2024 |
| Social protest, violence and terror in nineteenth and twentieth century Europe | | Monograph or Collective Volume | Macmillan | 1982 |
| Society and settlement in the valley of Glenasmole, 1750-1900 | Nolan, William | Article in Book | Geography Publications | 1992 |
| Some civil and ecclesiastical territorial divisions and their geographical significance | Nolan, William | Article in Book | | 1986 |
| Some notes on St. John's church | Gacquin, William | Article in Journal | | 2004 |
| Some notes on the buildings of Drogheda Grammar School | Glynn, William M. | Article in Journal | | 1949 |
| Some notes on the old fortifications of Drogheda | Allen, W. P. | Article in Journal | | 1944 |
| Some old Limerick newspapers | Mulligan, William P. | Article in Journal | | 2004 |
| Some recollections | Gleeson, W. W. | Article in Journal | | 1988 |
| Sources for local studies | Nolan, William | Monograph or Collective Volume | The author | 1978 |
| Sources of law of the Church of Ireland : identification, investigation and reform | Colton, W. Paul | Thesis | | |
| St Canice's place (ancient Bull Alley) and Vicar Street | Gibb, J. S.Phelan, W. J. | Article in Journal | | 1957 |
| St Columba's Church - Church of Ireland | Paton, William | Article in Journal | | 1985 |
| St Mary's Church, Haddington Road and its environs | Doran, LindaDoran, WilliamSpencer, Kevin | Monograph or Collective Volume | St Mary's Church, Haddington Rd. | 1989 |
| St Mary's, Athlone | Quinn, W. A. | Article in Journal | | 1951 |
| St Saviour's Church, Dublin : centenary 1861-1961 | O'Riordan, W. M. | Article in Journal | | 1962 |
| St. Patrick's Church Jordanstown, 1868-1958 | McCappin, William J., Rev. | Monograph or Collective Volume | Northern Whig (printer) | 1958 |
| St. Patrick's Church Jordanstown, 1868-1993 | McCappin, William J., Rev.,Rodgers, Derek | Monograph or Collective Volume | Regency Press (printer) | 1993 |
| Stair Éamuinn Uí Chléire : Rabelais agus foinsí eile | Mahon, William J. | Article in Book | | 2016 |
| Stair Éamuinn Uí Chléire: Rabelais agus foinsí eile. | Mahon, William J. | Article in Book | Ollscoil na hÉireann | 2016 |
| Statues, dust-bins and whirlgigs : the last years of the town commissioners in Wicklow | Vaughan, Walter | Article in Journal | | 1988 |
| Strabane Presbyterianism | Roulston, William J. | Article in Book | | 2000 |
| Sub-Inspector Thomas Trant of Callan and 1848 Rising | Nolan, William | Article in Book | | 2007 |
| Succession lists of parish priests in the archdiocese of Dublin, 1771-1963 | O'Riordan, W. M. | Article in Journal | | 1971 |
| Supplement to County Wexford trials of 1798 | Sweetman, William | Monograph or Collective Volume | The Pike Press | 2021 |
| Supporting the institution of marriage in Ireland | Duncan, W. R. | Article in Journal | | 1978 |
| Survey, valuation and census of the Barony of Portnehinch, compiled in the year 1819 | Mason, W. S. | Monograph or Collective Volume | | 1821 |
| Swift's tale : on satire, negation, and the uses of irony | Carnochan, W. B. | Article in Journal | | 1971 |
| Tales of the Pampas | Bulfin, William | Monograph or Collective Volume | L.O.L.A. | 1997 |
| Terrorist challenge to the rule of law : the British experience | Nelson, William R. | Article in Journal | | 1990 |
| Terrorist challenge to the rule of law : the British experience | Nelson, William R. | Article in Journal | | 1990 |
| The "Claddagh" ring | Dillon, W. | Article in Journal | | 1905 |
| The 1718 migration : from Ulster to New England | Lunney, LindeRoulston, William | Monograph or Collective Volume | Ulster Scots Agency | 2017 |
| The 1733 visitation of Kilmore: a window on an early eighteenth-century Church of Ireland diocese | Roulston, William J. | Article in Journal | | 2006 |
| The 1833 arms register for Co. Cavan | Coleman, William G. | Article in Journal | | 1978 |
| The 1990 Synod of Bishops : priestly formation | Dalton, William | Article in Journal | | 1990 |
| The agricultural revolution | McGeown, William | Article in Journal | | 2002 |
| The American Irish | Shannon, William V., 1927-1988 | Monograph or Collective Volume | Macmillan | 1964 |
| The angler in County Clare, 1833 | Bilton, William | Article in Book | | 1998 |
| The Anglo-Norman version | Burgess, Glyn Sheridan | Article in Book | University of Exeter Press | 2002 |
| The application of water power to industrial purposes in the north of Ireland | McCutcheon, W. A. | Article in Journal | | 1965 |
| The archaeological fabric of a manor in the Ulster Plantation : Dunnalong, County Tyrone | Roulston, William J. | Article in Book | NA | 2013 |
| The Armada wrecks on the Irish coast | Green, William Spotswood | Article in Journal | | 1902 |
| The Bad Times: Waterford Country Houses During the Revolutionary Period | Fraher, William | Monograph or Collective Volume | Waterford County Museum | 2022 |
| The Bailieborough estate | Coleman, William | Article in Journal | | 1968 |
| The beginnings of Christianity in Ireland | Hanson, W. G. | Article in Journal | | 1935 |
| The beginnings of grammar schools in Ireland | Ferguson, W. S. | Article in Journal | | 1942 |
| The black prophet 1847 : [a tale of Irish famine] | Carleton, William | Monograph or Collective Volume | Woodstock | 1996 |
| The Book of Domhnall Ó Duibhdábhoireann, provenance and codicology | O'Sullivan, William, 1921-2000 | Article in Journal | | 1999 |
| The Book of Howth | | Article in Book | | 1871 |
| The Book of Kells | O'Sullivan, William, 1921-2000 | Article in Book | | 1967 |
| The book of Uí Maine, formerly the book of Ó Dubhágain : scripts and structure | O'Sullivan, William, 1921-2000 | Article in Journal | | 1989 |
| The British Army in Ireland | Sheehan, William | Article in Book | | 2017 |
| The British army's experience in Cork city and county, 1919-1921 | Sheehan, William | Thesis | | 2008 |
| The Bronze age copper mines of the Goleen area, Co. Cork | O'Brien, William | Article in Journal | | 2003 |
| The canals of the north of Ireland | McCutcheon, W. A. | Monograph or Collective Volume | David & Charles | 1965 |
| The Carolans of Glenvaunish, Mountshannon | Fallon, Willie | Article in Journal | | 2003 |
| The case for a 'Principality of Ulster' | Kingston, William | Article in Journal | | 1975 |
| The Catalan version | Burrell, Margaret | Article in Book | University of Exeter Press | 2002 |
| The Catholic University school of medicine | Doolin, William | Article in Book | | 1954 |
| The census of Ireland 1911 | Thompson, William | Article in Journal | | 1913 |
| The charter towns of Ulster | Robinson, Philip S.Roulston, WilliamScott, Brendan | Article in Journal | | 2013 |
| The Christian Endeavour Union of Great Britain and Ireland | Chaplin, W. K. | Article in Book | | 1946 |
| The chronology of the first Anglo-Irish coinage | Dolley, MichaelO'Sullivan, William, 1908-1992 | Article in Book | | 1967 |
| The Church of Ireland : St Saviour's Church, Arklow | Vanston, W. F. H. | Article in Journal | | 1984 |
| The closure of the Limerick House of Industry in 1841 | Mulligan, William P. | Article in Journal | | 2006 |
| The coinages for Ireland of Henry VIII | Dolley, MichaelHackmann, W. D. | Article in Journal | | 1970 |
| The contribution of Séamus Ó Cinnéide to the School's Folklore Collection, 1937-8 | Nolan, William | Article in Book | | 2019 |
| The corn mill in Ulster | McCutcheon, W. A. | Article in Journal | | 1970 |
| The Corofin (Co. Clare) hoard : late twelfth - early thirteenth centuries | Dolley, MichaelO'Sullivan, William, 1908-1992 | Article in Journal | | 1965 |
| The Cove free schools, 1829 | Hogan, William | Article in Journal | | 1962 |
| The cries of Dublin | Hamilton, Hugh DouglasLaffan, William | Monograph or Collective Volume | Irish Georgian Society | 2003 |
| The crisis in Ireland, an account of the present condition of Ireland and suggestions towards reform | Wyndham-Quin, Windham Thomas, 4th Earl of Dunraven | Monograph or Collective Volume | Hodges Figgis | 1905 |
| The dam builders : the story of the men who built the Silent Valley reservoir | Carson, W. H. | Monograph or Collective Volume | Mourne Observer | 1981 |
| The dating of the Mt Gabriel-type copper mines of West Cork | O'Brien, William | Article in Journal | | 1987 |
| The deep sea and coast fisheries of Ireland, with suggestions for the working of a fishing company | Brabazon, Wallop | Monograph or Collective Volume | | 1848 |
| The development of surgical training in Ireland | MacGowan, W. A. L. | Article in Book | | 2008 |
| The development of the hillfort in prehistoric Ireland | O'Brien, William | Article in Journal | | 2017 |
| The Dillons of Carlow | Davidson-Houston, W. E. C. | Article in Journal | | 1962 |
| The distribution of books from Belfast : the evidence of subscription lists | McCann, Wesley | Article in Book | | 1996 |
| The donor of the Book of Kells | O'Sullivan, William, 1921-2000 | Article in Journal | | 1958 |
| The Dutch version | Gerritsen, W. P.King, Peter K. | Article in Book | University of Exeter Press | 2002 |
| The earl bishop : the life of Frederick Hervey, bishop of Derry, earl of Bristol. 2 vols. | Childe-Pemberton, W. S. | Monograph or Collective Volume | | 1925 |
| The earl-bishop : the life of Frederick Hervey, bishop of Derry, earl of Bristol. 2 vols. | Childe-Pemberton, W. S. | Monograph or Collective Volume | | 1925 |
| The earliest Anglo-Irish coinage. | O'Sullivan, William, 1908-1992 | Monograph or Collective Volume | The Stationery Office | 1964 |
| The earliest Irish coinage | O'Sullivan, William, 1908-1992 | Article in Journal | | 1949 |
| The ecclesiastical history of Ireland. From the earliest period to the present times. 2 vols. | Killen, W. D. | Monograph or Collective Volume | | 1875 |
| The ecomonic history of Cork city from the earliest times to the Act of Union | O'Sullivan, William, 1908-1992 | Monograph or Collective Volume | [s.n.] | 1937 |
| The economic history of Cork City from the earliest times to the Act of Union | O'Sullivan, William, 1908-1992 | Monograph or Collective Volume | Cork University Press | 1937 |
| The economy and society, 1830-1845 | MacDonagh, Oliver | Article in Book | Clarendon Press | 1989 |
| The eighteenth century rebinding of manuscripts | O'Sullivan, William, 1921-2000 | Article in Journal | | 1970 |
| The election of 1841 or reign of terror in Carlow | Hadden, W. V. | Article in Journal | | 1970 |
| The enemy within, the enemy without : local government in nineteenth-century Limerick | Mulligan, William Patrick | Thesis | | 2005 |
| The engineering of the slobs | Anderson, William | Article in Book | | 1996 |
| The English legislature and the Irish courts | Johnston, William John | Article in Journal | | 1924 |
| The English legislature and the Irish courts | Johnston, W. J. | Article in Journal | | 1924 |
| The evolution of the Abercorn estate in north west Ulster, 1610-1703 | Roulston, William J. | Article in Journal | | 1999 |
| The experience of God in the writings of Saint Patrick : reworking a faith received (Tesi Gregoriana. Serie Teologia, 201) | Swan, William Declan | Monograph or Collective Volume | Pontifical Biblical Institute. Gregorian & Biblical Press | 2013 |
| The family name of Marmion | Marmion, William F. K. | Article in Journal | | 1995 |
| The Famine in Slieveardagh | Nolan, William | Article in Book | | 2008 |
| The final days of Meagher's Irish uprising | Nolan, William | Article in Book | | 2006 |
| The finances of Ireland before the Union and after | Wyndham-Quin, W. T., 4th Earl of Dunraven | Monograph or Collective Volume | | 1912 |
| The finances of Ireland before the Union and after | Wyndham-Quin, Windham Thomas, 4th Earl of Dunraven | Monograph or Collective Volume | | 1912 |
| The first adventure of the common law | Johnston, W. J. | Article in Journal | | 1920 |
| The Fleet Printing Company : recalling a trade printing house in the early 1950s | Simpson, W. G. | Article in Journal | | 1994 |
| The forces of the crown in Ireland, 1798 | Griffin, W. D. | Article in Book | | 1969 |
| The forces of the Crown in Ireland, 1798 | Griffin, W. D. | Article in Book | | 1969 |
| The forgotten hermitage of Skellig Michael | Horn, WalterMarshall, Jenny WhiteRourke, Grellan D. | Monograph or Collective Volume | University of California Press | 1990 |
| The foundation of the Conservation Laboratory | Vaughan, W. E. | Article in Book | | 2013 |
| The future of Ireland | Wyndham-Quin, W. T., 4th Earl of Dunraven | Article in Journal | | 1913 |
| The Gaelic Athletic Association in Dublin, 1884-2000 | Nolan, William | Monograph or Collective Volume | Geography Publications | 2005 |
| The genesis of Sinn Fein | Kingston, William V. | Thesis | | 1949 |
| The German version | Gerritsen, W. P.Strijbosch, Clara | Article in Book | University of Exeter Press | 2002 |
| The ghosts of Duffy's Cut : the Irish who died building America's most dangerous stretch of Railroad | OthersWatson, William E. | Monograph or Collective Volume | Conn Praeger | 2006 |
| The Golfing Union of Ireland, 1891-1991 | Menton, William A. | Monograph or Collective Volume | Gill & Macmillan | 1991 |
| 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 Pretender and Dean Swift to Flann O'Brien: from Ireland the novel in English | Colhoun, William James | Thesis | | |
| The hereditary lands and royal tuath of the O'Melaghlins | Moran, William | Article in Journal | | 1958 |
| The Hibernian-Argentinian : a forgotten branch of the Irish diaspora | MacLoughlin, William | Article in Journal | | 1994 |
| The Hibernian-Argentinian. A forgotten branch of the Irish diaspora | McLoughlin, William | Article in Journal | | 1997 |
| The historian as 'private eye' | Warren, Wilfred Lewis, 1929- | Article in Book | | 1974 |
| The historical St. Columba. | Simpson, W. D. | Monograph or Collective Volume | | 1963 |
| The history and antiquities of the collegiate and cathedral church of St Patrick near Dublin, from its foundation in 1190 to the year 1819 | Mason, W. M. | Monograph or Collective Volume | | 1820 |
| The history and antiquities of the diocese of Ossory | Carrigan, William, 1860-1924 | Monograph or Collective Volume | [s.n.] | 1981 |
| The history and antiquities of the diocese of Ossory. 1:Introduction and Extent, Deaneries, Bishops, Chapter and Colleges of the diocese of Ossory; 2 : Northern Deanery of Ossory Diocese; 3 : The Middle Deanery, including the Cathedral City of the Diocese of Ossory; 4 : The Southern Deanery of the Diocese of Ossory. 4 vols. | Carrigan, William, 1860-1924 | Monograph or Collective Volume | | 1905 |
| The history of Éamonn O'Cleary | Ó Neachtáin, Seán | Monograph or Collective Volume | Cló Iar-Chonnachta | 2000 |
| The history of the potato and its progress in Ireland | Davidson, W. H. | Article in Journal | | 1937 |
| The illness of Dean Swift | Brain, W. R., Sir | Article in Journal | | 1952 |
| The imagination of an insurrection, Dublin, Easter 1916 | Thompson, William Irwin | Monograph or Collective Volume | Oxford University Press | 1967 |
| The immigrant in Nevada's short stories and biographical essays | Shepperson, Wilbur Stanley | Article in Journal | | 1970 |
| The industrial archaeology of Northern Ireland | McCutcheon, W. A. | Monograph or Collective Volume | HMSO | 1980 |
| The influence of Ireland on the Newfoundland ballad | Kirwin, William | Article in Book | | 1977 |
| The insolence of Dissenters? Religious controversy in Ballintoy in 1716 | Roulston, W.J. | Monograph or Collective Volume | Ballintoy Archaeological and Historical Society | 2018 |
| The interpretation of 12th century Irish history | Warren, Wilfred Lewis, 1929- | Article in Book | | 1969 |
| The interpretation of twelfth-century Irish history | Warren, Wilfred Lewis, 1929- | Article in Book | | 1969 |
| The Irish | Shannon, William V., 1927-1988Sklare, Marshall | Article in Journal | | 1965 |
| The Irish 'remnaunt' of John Bale's manuscripts | O'Sullivan, William, 1921-2000 | Article in Book | | 1995 |
| The Irish Confederation in County Tipperary in 1848 | Nolan, William | Article in Journal | | 1998 |
| The Irish Diaspora : the larger context | Mulligan, William H. | Article in Journal | | 2006 |
| The Irish fox and the British lion | Jackson, W. T. | Article in Journal | | 1959 |
| The Irish historical library | Nicolson, William | Monograph or Collective Volume | | 1724 |
| The Irish in America : starvation, struggle and success | Shannon, William V., 1927-1988 | Article in Book | | 1977 |
| The Irish in America, 550-1972 | Griffin, William D. | Monograph or Collective Volume | Oceana Publications | 1972 |
| The Irish in the American Revolution | Tobin, William A., Rev. | Monograph or Collective Volume | Our Faith Press | 1950s? |
| The Irish labour movement : from the twenties to our own day | Ryan, William | Monograph or Collective Volume | Talbot Press | 1919 |
| The Irish language and the Young Ireland / Irish Confederation | Nolan, William | Article in Book | | 2012 |
| The Irish literary revival : its history, pioneers and possibilities | Ryan, W. P. | Monograph or Collective Volume | | 1894 |
| The Irish manuscripts in Case H in Trinity College, Dublin, catalogued by Matthew Young in 1781 | O'Sullivan, William, 1921-2000 | Article in Journal | | 1976 |
| The Irish on the continent in the eighteenth century | Griffin, W. D. | Article in Journal | | 1976 |
| The Irish revolution and how it came about | O'Brien, William | Monograph or Collective Volume | Maunsel and Roberts | 1923 |
| The Journal of Thomas Moore. Volume 1 [1818-1820] | | Monograph or Collective Volume | University of Delaware Press|Associated University Presses | 1983 |
| The Journal of Thomas Moore. Volume 2. 1821-1825 | | Monograph or Collective Volume | University of Delaware Press|Associated University Presses | 1984 |
| The Journal of Thomas Moore. Volume 3. 1826-1830 | | Monograph or Collective Volume | University of Delaware Press|Associated University Presses | 1986 |
| The Journal of Thomas Moore. Volume 4. 1831-1835 | | Monograph or Collective Volume | University of Delaware Press|Associated University Presses | 1987 |
| The Journal of Thomas Moore. Volume 5. 1836-1842 | | Monograph or Collective Volume | University of Delaware Press|Associated University Presses | 1988 |
| The Journal of Thomas Moore. Volume 6. 1843-1847 | | Monograph or Collective Volume | University of Delaware Press|Associated University Presses | 1991 |
| The Kavanagh kings | Hadden, W. V. | Article in Journal | | 1968 |
| The Knights Templar in Ireland | Marmion, William F. K. | Article in Journal | | 1999 |
| The Labour revolt and Larkinism | Ryan, W. P. | Monograph or Collective Volume | Daily Herald | 1913 |
| The lady piper of Carnlough, Netta Jane Nicholl Johnstone, 1897-1953 | Garvin, Wilbert | Article in Journal | | 2004 |
| The Lagan navigation | McCutcheon, W. A. | Article in Journal | | 1962 |
| The land of Kildare : valuation, ownership and occupation 1850-1906 | Nolan, William | Article in Book | | 2006 |
| The lean years | McGeown, William | Article in Journal | | 2001 |
| The letters and papers of James Cotter junior, 1689-1720 | Hogan, WilliamÓ Buachalla, Liam | Article in Journal | | 1963 |
| The letters and papers of James Cotter, junior, 1689-1720 | Cotter, JamesHogan, WilliamÓ Buachalla, Liam | Article in Journal | | 1963 |
| The letters of Thomas Moore | Moore, Thomas, 1779-1852 | Monograph or Collective Volume | Clarendon Press | 1964 |
| The life and times of ... O'Connell | Fagan, W. | Monograph or Collective Volume | | 1847 |
| The Malone Mausoleum Kilbixy, Co. Westmeath | Laffan, William | Monograph or Collective Volume | The Follies Trust | 2024 |
| The manuscript collection of Dubhaltach Mac Fhirbhisigh | O'Sullivan, William, 1921-2000 | Article in Book | | 2000 |
| The Marmion family in Ireland and in general | Marmion, William F. K. | Monograph or Collective Volume | St. Lazarus press | 1997 |
| The Marmion family of Carlingford to 1660 | Marmion, William F. K. | Article in Journal | | 1998 |
| The Marquess Wellesley, K.G. | Hutton, W. H., Dean of Winchester | Monograph or Collective Volume | | 1893 |
| The merchant marine | Benson, William S. | Article in Journal | | 1923 |
| The migration policy of the Irish Land Commission in county Meath: theory and practice | Nolan, William | Article in Book | | 2015 |
| The minor orders of knighthood. St Thomas of Acre and St Lazarus of Jerusalem | Marmion, William F. K. | Article in Journal | | 1999 |
| The monastery of St Gall | Born, ErnestHorn, Walter | Article in Journal | [s.n.] | 1989 |
| The monastery of Tallaght | | Article in Journal | | 1911 |
| The Murphy riots : a Victorian dilemma | Arnstein, Walter L. | Article in Journal | | 1975 |
| The mythical past and the present moment | Thompson, William | Article in Book | | 1982 |
| The N.U.I. Club in London | O'Donovan, W. J. | Article in Journal | | 1946 |
| The nature and effects of protective policy in Ireland from 1921 | Ryan, W.J.L. | Thesis | | 1949 |
| The New Manuscripts Room (1958) | O'Sullivan, William | Article in Journal | | 2012 |
| The Newry navigation : the earliest inland canal in the British Isles | McCutcheon, W. A. | Article in Journal | | 1963 |
| The Nine Years' War in the north-west | Roulston, William J. | Article in Book | | 2000 |
| The Ninianic controversy | Simpson, W. D. | Article in Journal | | 1950 |
| The Norse version | Hamer, Andrew | Article in Book | University of Exeter Press | 2002 |
| The north and south moats, Naas | Gibson, William H. | Article in Journal | | 1987 |
| The O'Mearas of Illaunmore (Islandmore) on Lough Derg | Fallon, Willie | Article in Journal | | 2005 |
| The Occitan version | Burrell, Margaret | Article in Book | University of Exeter Press | 2002 |
| The Old Library, Trinity College Dublin, 1712-2012 | | Monograph or Collective Volume | Four Courts Press | 2012 |
| The only gold coins issued in Ireland, 1646 | O'Sullivan, William, 1908-1992 | Article in Journal | | 1965 |
| The original Kennedy cadets | Gibson, William H. | Article in Journal | | 2013 |
| The origins of the Reformed Presbyterian Church of Ireland, with some comments on its records | Roulston, William J. | Article in Journal | | 2008 |
| The palaeological background to the Book of Kells | O'Sullivan, William, 1921-2000 | Article in Book | | 1994 |
| The paper stairway : the Rev. Professor James McCosh and the case for intermediate education in Ireland, 1852-1868 | Patton, W. Donald | Article in Book | | 2002 |
| The parish of Upper Badoney, County Tyrone, in 1814 | Roulston, William | Article in Journal | | 2010 |
| The parishes of Leckpatrick and Dunnalong : their place in history | Roulston, William J. | Monograph or Collective Volume | Ulster Local History Trust | 2000 |
| The parliament of the Pale | Johnston, W. J. | Article in Journal | | 1918 |
| The Parnell of real life | O'Brien, William | Monograph or Collective Volume | | 1926 |
| The pathfinders | Doolin, William | Article in Journal | | 1945 |
| The plantation of Ulster map & pocket guide - the story of the English | Hunter, R. J. (Robert J.),Roulston, William J. | Monograph or Collective Volume | Ulster Historical Foundation | 2012 |
| The poet and the spae-wife | | Monograph or Collective Volume | Allen Figgis|Viking Society for Northern Research | 1960 |
| The Pope's green island | Ryan, William | Monograph or Collective Volume | Nisbet | 1912 |
| The Portaferry lifeboat | Brown, W. P. | Article in Journal | | 1987 |
| The portraits of King's Inns | Ryan-Smolin, Wanda | Article in Journal | | 1991 |
| The postage stamps of Ireland | Robertson, W. D. | Article in Journal | | 1942 |
| The potato : a survey of its history | Burton, W. G. | Monograph or Collective Volume | Chapman | 1948 |
| The priests of the parish of Muckalee | Carrigan, William, 1860–1924 | Article in Journal | | 1883 |
| The priests of the parish of St. John's, Kilkenny | Carrigan, William, 1860–1924 | Article in Journal | | 1883 |
| The priests of the parish of St. Patrick's, Kilkenny | Carrigan, William, 1860–1924 | Article in Journal | | 1883 |
| The primacy of foreign policy in British history, 1660-2000 : how strategic concerns shaped modern Britain | | Monograph or Collective Volume | Palgrave Macmillan | 2010 |
| The provision of Anglican places of worship in the parishes of Inishowen,1622-1733 | Roulston, William | Article in Journal | | 2018 |
| The provision, building and architecture of Anglican churches in the north of Ireland, 1600-1740 | Roulston, William J. | Thesis | | |
| The resurrection men | Doolin, William | Article in Book | | 1947 |
| The Rev.Humphrey Hunter | Hannon, W. B. | Article in Journal | | 1911 |
| The role of the parish in building and maintaining Anglican churches in the north of Ireland 1660-1740 | Roulston, William J. | Article in Book | | 2006 |
| The Royal College of Surgeons in Ireland | MacGowan, W. A. L. | Article in Journal | | 1973 |
| The ruins of great Ireland in New England | Goodwin, William B. | Monograph or Collective Volume | Meador Publishing Company | 1946 |
| The Ruxtons of Ardee | Ruxton, William | Article in Journal | | 1996 |
| The Saundersons of Castle Saunderson | Curtin, Winifred | Article in Journal | | 2003 |
| The Scots in plantation Cavan, 1610-42 | Roulston, William J. | Article in Book | | 2009 |
| The Scottish and Irish background of the Rev. Hugh Conn of the colonial clergy of Maryland | Conn, W. Clark | Article in Journal | | 1994 |
| The Shannon scheme : a forgotten Limerick connection | Gleeson, W. W. | Article in Journal | | 1983 |
| The shaping of Ireland : the geographical perspective | | Monograph or Collective Volume | Mercier Press in association with Radio Telefís Éireann | 1986 |
| The silicified wood of Lough Neagh | Swanston, William | Article in Journal | | 1893 |
| The similes in the book of Leinster Táin bó Cúailnge | Glennon, William F. X. | Article in Journal | | 1997 |
| The Sinclairs of Belfast and the United States. Transatlantic business networks in the Victorian era | Roulston, William | Article in Journal | | 2016 |
| The Slane manuscript of the Annals of the Four Masters | O'Sullivan, William, 1921-2000 | Article in Journal | | 1999 |
| The story of Ireland : a history of an ancient family and their country | Magan, William | Monograph or Collective Volume | Element | 2000 |
| The story of west Carbery | Kingston, W. J. | Monograph or Collective Volume | Friendly Press | 1985 |
| The Strafford inquisition of County Mayo (R.I.A. Ms. 24 E 15) | | Monograph or Collective Volume | Irish Manuscripts Commission | 1958 |
| The study of Provenance in older printed books | McCann, Wesley | Article in Journal | | 1984 |
| The sublime and the beautiful : Irish art 1700-1830 | | Monograph or Collective Volume | Pyms Gallery | 2001 |
| The succession of parish priests in the archdiocese of Dublin, 1771-1851 | O'Riordan, W. M. | Article in Journal | | 1956 |
| The Tailors' Hall, Back Lane | Dillon, William | Article in Journal | | 1960 |
| The tenure and improvement of land in Ireland considered with reference to the relation of landlord and tenant and tenant-right | Ferguson, W. D.Vance, Andrew | Monograph or Collective Volume | | 1851 |
| The two famines | Gleeson, W. W. | Article in Journal | | 1984 |
| The Ulster museum | McCutcheon, W. A. | Article in Journal | | 1980 |
| The Ulster plantation and its impact on the settlement pattern of Co. Tyrone | Robinson, William | Article in Book | | 2000 |
| The Ulster plantation in the manor of Dunnalong, 1610-70 | Roulston, William J. | Article in Book | | 2000 |
| The University Press | O'Sullivan, William, 1921-2000 | Article in Journal | | 1958 |
| The use of documentary source material in the Northern Ireland survey of industrial archaeology | McCutcheon, W. A. | Article in Journal | | 1966 |
| The Venetian version | Davie, Mark | Article in Book | University of Exeter Press | 2002 |
| The voyage of Saint Brendan : representative versions of the legend in English translation | | Monograph or Collective Volume | University of Exeter Press | 2002 |
| The wearing of the green : the lore, literature, legend and balladry of the Irish in Australia | | Monograph or Collective Volume | Lansdown Press | 1966 |
| The Western front : Irish voices from the Great War | Sheehan, William, 1968- | Monograph or Collective Volume | Gill & Macmillan | 2011 |
| The world of names | Nicolaisen, Wilhelm Fritz Hermann | Article in Journal | | 1996 |
| Theft, concealment and exposure: Nathaniel Hone's 'The Spartan Boy' | Laffan, William | Article in Book | | 2016 |
| Thesis abstract : the provision, building and architecture of Anglican churches in the North of Ireland, 1600-1740 | Roulston, William J. | Article in Journal | | 2005 |
| Thomas D'Arcy McGee : turning points in the life of a nationalist | Kirwin, William | Article in Book | | 1988 |
| Thomas Roberts : landscape and patronage in eighteenth-century Ireland | Laffan, William,Rooney, Brendan | Monograph or Collective Volume | Churchill House Press for the National Gallery of Ireland | 2009 |
| Thomas Sinclair : 'Ulster's most prominent citizen' | Greenlee, GrahamLucy, GordonRoulston, William | Monograph or Collective Volume | Ulster-Scots Agency & Ulster Historical Foundation | 2016 |
| Three centuries of life in a Tyrone parish : a history of Donagheady from 1600 to 1900 | Roulston, William J. | Monograph or Collective Volume | Strabane History Society | 2010 |
| Three notes on Laud Misc. 610 (or the Book of Pottlerath) | O'Sullivan, AnneO'Sullivan, William, 1921-2000 | Article in Journal | | 1971 |
| Through a different lens : the Irish landscape as seen by mining promoters, 1835-80 | Mulligan, William H., Jr. | Article in Book | | 2008 |
| Thurles : the Cathedral town : essays in honour of Archbishop Thomas Morris | | Monograph or Collective Volume | Geography Publications | 1989 |
| Thurles from a distance | Nolan, William | Article in Book | | 1989 |
| Tipperary : History and Society | | Monograph or Collective Volume | Geography Publications | 1985 |
| To God be the glory : the personal memoirs of Rev. W.P. Nicholson with first-hand news account of the Nicholson era | Heeney, MavisNicholson, William | Monograph or Collective Volume | Ambassador | 2004 |
| To sail the crested sea | Nixon, W. M. | Monograph or Collective Volume | Irish Cruising Club | 1979 |
| Tombstone inscriptions Cam old cemetery | Gasquin, William | Monograph or Collective Volume | Cam Cemetery Committee | 1992 |
| Toor More (Corrandhu): a bronze age hillfort in North Kilkenny | O'Brien, William | Article in Journal | | 2017 |
| Tracing the past : sources for local studies in the Republic of Ireland | Nolan, William | Monograph or Collective Volume | Geography Publications | 1982 |
| Trade and traders in plantation Ulster, c.1600–c.1650 | Roulston, William ; Scott, Brendan | Article in Journal | | 2022 |
| Transatlantic Lives: The Irish Experience in Colonial America | | Monograph or Collective Volume | Ulster Historical Foundation | 2019 |
| Transnational activism, solidarity and Ireland : an introduction | Smith, Evan, Crozier-De Rosa, Sharon, Wintermute, Jimmy | Article in Journal | | 2024 |
| Transport, 1820-1914 | McCutcheon, W. A. | Article in Book | | 1985 |
| Travels in Holland, the United Provinces, England, Scotland, and Ireland, 1634-1635 | Brereton, William, Sir, 1604-1661Hawkins, Edward, 1780-1867 | Monograph or Collective Volume | | 1844 |
| Trinity College, Dublin | Dixon, W. M. | Monograph or Collective Volume | | 1902 |
| Tullamore | Moran, William | Article in Journal | | 1962 |
| Tullylease | Larkin, William Paschal | Article in Journal | | 1978 |
| Two case studies of local library provision : Belfast | McCann, Wesley | Article in Book | | 2006 |
| Two Clogher constitutions | O'Sullivan, William, 1921-2000 | Article in Journal | | 1996 |
| Two Clogher constitutions | O'Sullivan, William, 1921-2000 | Article in Book | | 1994 |
| Two early medieval monasteries | Horn, Walter | Article in Book | | 1973 |
| Two elections | Gleeson, W. W. | Article in Journal | | 1983 |
| Two new works by Thomas Roberts (1748-1777) | Laffan, WilliamRooney, Brendan | Article in Journal | | 2012 |
| Two sixteenth century Munster primates : Donnchadh Ó Taidhg (1560-62) & Richard Creagh (1564-85) | O'Brien, W. P. | Article in Journal | | 1989 |
| Tyrone : history and society | | Monograph or Collective Volume | Geography Publications | 2000 |
| Tyrone precinct : a history of the plantation settlement of Dungannon and Mountjoy to modern times | Hutchinson, W. R. | Monograph or Collective Volume | Erskine | 1951 |
| Uisneach, Tara and the rise of monarchy | Moran, William | Article in Journal | | 1959 |
| Ulster and the Irish republic | Carson, William A.Gray, David | Monograph or Collective Volume | [s.n.] | 1957 |
| Ulster's contribution to the Carolinas | Patterson, W. B. | Article in Journal | | 1977 |
| Ulster-Scots in Northern Ireland: from neglect to re-branding | Hutchinson, Wesley | Article in Journal | | 2013 |
| Uniforms of the Fifth Royal Irish Dragoons | Carman, William Y. | Article in Journal | | 1999 |
| Ussher as a collector of manuscripts | O'Sullivan, William, 1921-2000 | Article in Journal | | 1956 |
| Vanishing Derry | Carson, William A. | Monograph or Collective Volume | Donegal Democrat | 1978 |
| Victorian prejudice re-examined | Arnstein, Walter L. | Article in Journal | | 1969 |
| Violence and war in Europe and Ireland, 1911-14 | Mulligan, William | Article in Book | | 2013 |
| W. F. Mulvany : an Irish pioneer in the Ruhr, Great Britain, and industrial Europe, 1750-1870 | Henderson, W. O. | Monograph or Collective Volume | [s.n.] | 1954 |
| Wages and employment in Northern Ireland and Scotland between the wars : the case of shipbuilding | Geary, Frank ; Johnson, W. | Article in Book | Carnegie | 1995 |
| Was Ireland ever invaded by the Romans? | Watkin, W. T. | Article in Journal | | 1887 |
| Water power in the north of Ireland | McCutcheon, W. A. | Article in Journal | | 1970 |
| Water-powered corn and flax scotching mills in Ulster | McCutcheon, W. A. | Article in Journal | | 1966 |
| Waterford : history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | | 1992 |
| Welsh, Scottish and English settlement in County Monaghan in the Seventeenth and Early Eighteenth centuries | Roulston, William | Article in Journal | | 2011 |
| Were there any Irish names among the first crusades | Marmion, William F. K. | Article in Journal | | 1999 |
| Westmeath elections, 1970-2020 | Durkan, William | Article in Book | Geography Publications | 2022 |
| Wexford : History and Society : Interdisciplinary essays on the History of an Irish county | | Monograph or Collective Volume | Georgraphy Publications | 1987 |
| What Gladstone could teach the EU | Kingston, William | Article in Journal | | 2013 |
| What's past is prologue : a retrospect of Irish medicine | | Monograph or Collective Volume | Monument Press | 1952 |
| When we were boys in Cork : an exile's memories | Cronin, Willie | Article in Journal | | 1941 |
| Wicklow : history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 1994 |
| William Carleton : the autobiography | Carleton, WilliamKiely, Benedict | Monograph or Collective Volume | White Row Press | 1996 |
| William IV and his Catholic subjects | Allen, W. G. | Article in Journal | | 1957 |
| William Marshall, earl of Pembroke | Hadden, W. V. | Article in Journal | | 1971 |
| William McCleary and the trade iun pirated caricatures in early nineteenth-century Dublin: part 1 - 'Unlawfully Participating in the profits of their Labour' | Beltrametti, SilviaLaffan, William | Article in Journal | | 2020 |
| William Molyneux's geographical collections for Kerry | | Article in Journal | | 1971 |
| William Orpen : an onlooker in France : a critical edition of the artist's war memories | Orpen, William, Sir, 1878-1931 | Monograph or Collective Volume | Paul Holberton | 2008 |
| William Sadler's views of Killua castle, Co. Westmeath | Ryan-Smolin, Wanda | Article in Journal | | 1996 |
| William Thompson's appeal (1825) | Thompson, William | Monograph or Collective Volume | Cork University Press | 1997 |
| Willibrord en zijn tijd | Lampen, W. | Monograph or Collective Volume | Van Kampen | 1948 |
| Wir lachen, weil wir weinen | Kaufmann, Walter | Monograph or Collective Volume | Buckham | 1977 |
| Zu den Versen des Abtes Cellanus von Péronne | Levison, Wilhelm | Article in Journal | | 1936 |
| ‘And this in thriving and prosperous Antrim!’ : an Anglo-Irish landlord’s perspective on the famine | Hutchinson, Wesley | Article in Journal | | 2014 |
| ‘The bishop of Rosscarbery to the lord justices touching the present estate of Munster’, 1582 | Lyon, William | Article in Book | | 2016 |
| ‘The opinion of William Mostyn touching the service of Connacht, how the same may be brought to better obedience to her Majesty than it was these 40 years past without any charge to her Highness’, 1597 | Mostyn, William | Article in Book | | 2016 |
| “Once it was Ireland, Now it is Kenya” : anti-colonialism and internationalism in the pages of the Connolly Association’s Irish Democrat in the 1950s–60s | Smith, Evan, Wintermute, Jimmy | Article in Journal | | 2024 |