| "Too old at thirty-three" : the log of William Henry O'Brien, 1908-10 | Share, Bernard | Article in Journal | | 2005 |
| ‘To solitude consigned’ : the Tasmanian journal of William Smith O’Brien, 1849-1853 | | Monograph or Collective Volume | Crossing Press | 1995 |
| 'Make way for the Molly Maguire's!' The Ancient Order of Hibernians and the Irish Parliamentary Party, 1902-4 | McCluskey, Fergal | Article in Journal | | 2012 |
| 'That dear long ago' : the story of Canon Sheehan and William O'Brien | O'Rahilly, Sean | Article in Journal | | 1983 |
| 'The last of the hereditary bards of Thomond' Séamus Mac Cruitín, 1815-70 | Ó Dálaigh, Brian | Article in Journal | | 2007 |
| 100 years of Liberty Hall : papers on the history of SIPTU, given at the Irish Labour History Society Conference, 22 October 2009 | | Monograph or Collective Volume | [SIPTU] | 2013 |
| A Clareman in Van Diemen's land : the Tasmanian journal of William Smith O'Brien | Nolan, William | Article in Journal | | 1992 |
| A forgotten revolution : the 1883 Labourers' Act in County Tipperary | Marnane, Denis G. | Article in Journal | | 2007 |
| A forgotten revolution: the 1883 Labourers' Act in County Tipperary | Marnane, Denis G. | Article in Journal | | 2008 |
| A nursery of editors : the Cork Free Press, 1910-1916 | Maume, Patrick | Article in Journal | | 2007 |
| An Irish radical in a Tory town : William O'Brien in Toronto, 1887 | Storz, Gerald J. | Article in Journal | | 1984 |
| An Irish rebel in Greece: William Smith O'Brien's 1856 visit | Davis, Richard | Article in Journal | | 2009 |
| Beyond the seas : the transportation of William Smith O'Brien | Kavanagh, Joan | Article in Book | | 1998 |
| Canon and martial law : William O'Brien, catholicism and Irish nationalism | Newsinger, John | Article in Journal | | 1981 |
| Captain Daniel Desmond Sheehan; an introductory essay | O'Donovan, John | Article in Journal | | 2015 |
| Catholic participation in the diplomacy of the Southern Confederacy | Stock, Leo Francis | Article in Journal | | 1930 |
| Christmas on the Galtees | O'Brien, William | Monograph or Collective Volume | L. Cusack | 2010 |
| Clearing the estates to fill the workhouses : King's County land agents and the Irish Poor Law Act, 1838 | Reilly, Ciarán J. | Article in Book | | 2011 |
| Containing Granuaile : Grace O'Malley in two nineteenth-century novels | Maume, Patrick | Article in Journal | | 2015 |
| Daniel Doyle: Young Irelander | Fenton, Laurence | Article in Journal | | 2015 |
| Dublin Fenianism in the 1880s : 'The Irish Culture of the Future?' | Kelly, Matthew | Article in Journal | | 2000 |
| Famous Irish prisoners : 14, more about Smith O'Brien | Piondar, Sean | Article in Journal | | 1946 |
| Forth the banners go : reminiscences of William O'Brien, as told to Edward MacLysaght | O'Brien, William | Monograph or Collective Volume | Three Candles | 1969 |
| From William O'Brien to de Valera: John Herlihy (1863-1941), a forgotten editor | Maume, Patrick | Article in Journal | | 2013 |
| In the Fenians' wake : Ireland's nineteenth-century crises and their representation in the sentimental rhetoric of William O'Brien MP and Canon Sheehan | Maume, Patrick | Article in Journal | | 1998 |
| John O'Donnell MP - The Voice of the Irish Peasant | Ó Domhnaill, Rónán Gearóid | Article in Journal | | 2023 |
| La ville de New York vue par les nationalistes irlandais dans la seconde moitié du XIXe siècle | Saison, Ghislaine | Article in Book | | 2000 |
| Letters of Irish interest | | Article in Journal | | 1948 |
| Mallow Volunteers 1913-1916 | Rutherford, Colman | Article in Journal | | 2016 |
| Memorial in favour of William Smith O’Brien, Kingstown, 1848 | Anonymous | Article in Journal | | 1995 |
| O'Connell's liberal rivals in 1843 | Sloan, Robert | Article in Journal | | 1996 |
| Recollections of Sophie O'Brien - Croagh Patrick 1904 | Clarke, Aidan | Article in Journal | | 2006 |
| Revolutionary imperialist : William Smith O'Brien, 1803-1864 | Davis, Richard | Monograph or Collective Volume | Lilliput | 1998 |
| Samuel Phayer-Harris, Protestant Nationalist and land campaigner | Phayer, John A. | Article in Journal | | 2019 |
| Seduced by sociability, cards and port wine : the misspent youth of William Smith O'Brien | Davis, Richard | Article in Journal | | 2013 |
| Sharman Crawford on the repeal question, 1847 | Kennedy, B. A. | Article in Journal | | 1949 |
| Smith O'Brien and the 'secession' | Gwynn, D. R. (Denis Rolleston), 1893-1972 | Article in Journal | | 1947 |
| Smith O'Brien and Young Ireland | Gwynn, D. R. (Denis Rolleston), 1893-1972 | Article in Journal | | 1947 |
| Smith O'Brien's retribution | Ó Cathaoir, Brendan | Article in Journal | | 1985 |
| Some aspects of William Smith O'Brien's parliamentary career : his links with the Royal Dublin Society | Heaney, Carmel | Article in Book | | 2009 |
| The 1848 petitions : the William Smith O'Brien petition/records at the National Archives of Ireland | | Monograph or Collective Volume | Eneclann | 2001 |
| The 1848 William Smith O'Brien petition | Medlycott, Elinor (née Nuttall) | Article in Journal | | 2002 |
| The appeal of the United Irish League in co. Roscommon 1903-7 | Clarke, Marie | Article in Journal | | 1994 |
| The Battle for Liberty Hall | Watts, Gerry | Article in Journal | | 2015 |
| The charities and famine in mid-nineteenth-century Ireland | O'Neill, Timothy P. | Article in Book | NA | 1999 |
| The foundation of the National Library of Ireland, 1836-1877 | Long, Gerard | Article in Journal | | 1991 |
| The funeral of William Smith O'Brien | McMahon, Jerry | Article in Journal | | 1990 |
| The Irish Parliamentary Party and the third Home Rule crisis | McConnel, James | Monograph or Collective Volume | Four Courts | 2013 |
| The letters of Mrs William O'Brien | O'Rahilly-Mahoney, Sean | Article in Journal | | 1984 |
| The pioneers : Larkin and O'Brien : the story of a feud | Lysaght, D. R. O'Connor | Article in Book | | 2013 |
| The pioneers : William O'Brien | Byrne, Brendan | Article in Book | | 2013 |
| The rake's progress of a syndicalist : The political career of William O'Brien, Irish labour leader | Lysaght, D. R. O'Connor | Article in Journal | | 1983 |
| The rakes' progress of a syndicalist : the political career of William O'Brien, Irish labour leader | O'Connor Lysaght, D. R. | Article in Journal | | 1983 |
| The rebel in his family : selected papers of William Smith O'Brien | Davis, MarianneDavis, Richard | Monograph or Collective Volume | Cork University Press | 1998 |
| The reluctant rebel : William Smith O'Brien | Davis, Richard | Article in Journal | | 1998 |
| The Times versus William Smith O'Brien | Touhill, Blanche M. | Article in Journal | | 1982 |
| The Tinsley portrait sketches of the Wiliam Smith O'Brien trial | Forbes, J. D. | Article in Journal | | 1953 |
| The United Irish League in Drogheda from minute books 1900-1901 | Fleming, Edward | Article in Journal | | 2011 |
| The United Irish League. First Public Meeting in Westport 120 years ago | Clarke, Aiden | Article in Journal | | 2018 |
| Travels of William Smith O'Brien in Europe and the wider world 1843 to 1864 | Davis, Richard | Monograph or Collective Volume | Geography Publications | 2013 |
| Two wild nights in Ballinglen (2) the widow's roof (3) William O'Brien | Langan, Tom | Article in Journal | | 1988 |
| William O'Brien | Kelleher, Margaret | Article in Journal | | 1985 |
| William O'Brien : a great Irishman and a great Irish nationalist | Sheehan, D. D. (Daniel Desmond) | Article in Book | | 1942 |
| William O'Brien and partition | Power, Bill | Article in Journal | | 2001 |
| William O'Brien and the All for Ireland League | Schilling, F.K. | Thesis | | 1956 |
| William O'Brien and the Irish land war | Warwick-Haller, Sally | Monograph or Collective Volume | Irish Academic Press | 1990 |
| William O'Brien and the Kingston estate | Power, Bill | Article in Journal | | 1994 |
| William O'Brien and the Land War in Ireland 1877-1903 | Warwick-Haller, Sally | Thesis | | |
| William O'Brien's Canadian correspondence | Lyne, Daniel C. | Article in Journal | | 1971 |
| William O'Brien, 1881-1968 : socialist, republican, Dáil deputy, editor, and trade union leader | Morrissey, Thomas J. | Monograph or Collective Volume | Four Courts | 2007 |
| William O'Brien, 1881-1968 and the Irish labour movement | Mitchell, Arthur | Article in Journal | | 1971 |
| William O'Brien, 1903-10 | Spain, Stephen L. | Thesis | | 1962 |
| William O'Brien, M. P. : the years 1889 to 1891 | Forde, Robert | Article in Journal | | 1988 |
| William O'Brien, MP : The Metropolitan and International Dimensions of Irish Nationalism | Bull, Philip | Article in Journal | | 2009 |
| William O'Brien, MP : the metropolitan and international dimensions of Irish nationalism | Bull, Philip | Article in Journal | | 2009 |
| William O'Brien, MP : the metropolitan and international dimensions of Irish nationalism | Bull, Philip | Article in Book | | 2011 |
| William O'Brien, Mr. Balfour's prisoner | Smith, Beverly A. | Article in Journal | | 1983 |
| William Smith O'Brien | Gwynn, D. R. (Denis Rolleston), 1893-1972 | Article in Journal | | 1946 |
| William Smith O'Brien 1803-1864 | Bugler, Paul | Article in Journal | | 2003 |
| William Smith O'Brien : Ireland 1848 - Tasmania | Davis, Richard | Monograph or Collective Volume | Geography Publications | 1989 |
| William Smith O'Brien and his Irish revolutionary companions in penal exile | Touhill, Blanche M. | Monograph or Collective Volume | University of Missouri Press | 1981 |
| William Smith O'Brien and his second | De Bhaldraithe, Pádraig | Article in Journal | | 1989 |
| William Smith O'Brien and the American civil war | David, Richard | Article in Journal | | 1993 |
| William Smith O'Brien and the Young Ireland rebellion of 1848 | Sloan, Robert | Monograph or Collective Volume | Four Courts | 2000 |
| William Smith O'Brien in Van Diemen's Land | Heaney, Carmel | Article in Journal | | 1998 |
| William Smith O'Brien in Van Diemen's land 1849-1864 | Cussen, John | Article in Journal | | 1988 |
| William Smith O'Brien, 1803-1864 | Heaney, Carmel | Monograph or Collective Volume | Donatus Press | 2004 |
| William Smith O'Brien, 6th October 1803 - 18th June 1864 | O'Brien, Brendan | Article in Journal | | 1998 |
| William Smith O'Brien, an scoláire Gaeilge | Mac Peaircín, Liam, 1938-2019 | Article in Journal | | 2002 |
| William Smith O'Brien, Poor Laws and convicts | Davis, Richard P. | Article in Book | | 2011 |
| William Smith O'Brien. A plea for mercy from the people of Ireland | Duffy, Godfrey | Article in Journal | | 1994 |
| William Smith O’Brien : petitions of mercy | Duffy, Godfrey F. | Article in Journal | | 1995 |
| William Smith O’Brien as an imperialist | Davis, Richard | Article in Book | | 1995 |
| William Smith O’Brien’s secret family | Weir, Hugh W. L. | Article in Journal | | 1996 |