| '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 |
| 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 |
| Captain Daniel Desmond Sheehan; an introductory essay | O'Donovan, John | Article in Journal | | 2015 |
| Christmas on the Galtees | O'Brien, William | Monograph or Collective Volume | L. Cusack | 2010 |
| Dublin Fenianism in the 1880s : 'The Irish Culture of the Future?' | Kelly, Matthew | Article in Journal | | 2000 |
| 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 |
| Mallow Volunteers 1913-1916 | Rutherford, Colman | Article in Journal | | 2016 |
| Recollections of Sophie O'Brien - Croagh Patrick 1904 | Clarke, Aidan | Article in Journal | | 2006 |
| The appeal of the United Irish League in co. Roscommon 1903-7 | Clarke, Marie | Article in Journal | | 1994 |
| 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 |
| 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, 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, Mr. Balfour's prisoner | Smith, Beverly A. | Article in Journal | | 1983 |