| "Sentries of British Imperialism"? The question of British-based unions in Ireland | O'Connor, Emmet | Article in Journal | | 2006 |
| 'Big Jim' Larkin, the United States and the Easter rising | O'Connor, Emmet | Article in Book | University College Dublin Press | 2016 |
| A historiography of Irish labour | O'Connor, Emmet | Article in Journal | | 1995 |
| A history of the glorious struggle (review article) | O'Connor, Emmet | Article in Journal | | 1992 |
| A Labour history of Ireland, 1824-1960 | O'Connor, Emmet | Monograph or Collective Volume | | 1992 |
| A labour history of Waterford | O'Connor, Emmet | Monograph or Collective Volume | Waterford Council of Trade Unions | 1989 |
| A life in linenopolis : the memoirs of William Topping, Belfast, damask weaver, 1903-56 | O'Connor, Emmet,Parkhill, TrevorTopping, William, | Monograph or Collective Volume | Ulster Historical Foundation | 1992 |
| Active sabotage in industrial conflict, 1917-23 | O'Connor, Emmet | Article in Journal | | 1985 |
| Agrarian unrest and the labour movement in county Waterford 1917-23 | O'Connor, Emmet | Article in Journal | | 1980 |
| Agrarian unrest and the labour movement in county Waterford, 1917-1923 | O'Connor, Emmet | Article in Journal | | 1980 |
| An age of agitation | O'Connor, Emmet | Article in Journal | | 1983 |
| Behind the legend : Waterford men in the International Brigades in the Spanish civil war | O'Connor, Emmet | Article in Journal | | 2005 |
| Big Jim Larkin : hero and wrecker | O'Connor, Emmet | Article in Journal | | 2013 |
| Big Jim Larkin : hero or wrecker? | O'Connor, Emmet | Monograph or Collective Volume | University College Dublin Press | 2015 |
| Bolshevising Irish communism : the Communist International and the formation of the Revolutionary Workers' groups 1927-31 | O'Connor, Emmet | Article in Journal | | 2003 |
| Centenary article. 1907: a titanic year for Belfast labour | O'Connor, Emmet | Article in Journal | | 2007 |
| Dawn chorus : the origins of trade unionism in vocational education 1899-1930 | O'Connor, Emmet | Article in Book | | 1999 |
| Derry Labour in the age of agitation, 1889-1923. 1 : New unionism and old, 1889-1906 | O'Connor, Emmet | Monograph or Collective Volume | Four Courts | 2014 |
| Derry Labour in the age of agitation, 1889-1923. 2 : Larkinism and syndicalism, 1907-23 | O'Connor, Emmet | Monograph or Collective Volume | Four Courts | 2016 |
| Essay in review. Connecting Connolly | O'Connor, Emmet | Article in Journal | | 2006 |
| Essay. Hail Russia! Labour and the Bolshevik revolution | O'Connor, Emmet | Article in Journal | | 2017 |
| Friend or Foe? John Redmond and the Labour Movement, 1891-1918 | O'Connor, Emmet | Article in Journal | | 2018 |
| Irish labour and the Home Rule question, 1881-1914 | O'Connor, Emmet | Article in Journal | | 2019 |
| Irish trade union organization. [Review article] | O'Connor, Emmet | Article in Journal | | 2011 |
| James Larkin | O'Connor, Emmet | Monograph or Collective Volume | Cork University Press | 2002 |
| James Larkin in the United States, 1914-23 | O'Connor, Emmet | Article in Journal | | 2002 |
| Jim Larkin and the Communist International, 1923-9 | O'Connor, Emmet | Article in Journal | | 1999 |
| Labour and left politics | O'Connor, Emmet | Article in Book | | 1996 |
| Labour and politics, 1830-1945 : colonisation and mental colonisation | O'Connor, Emmet | Article in Book | | 2005 |
| Labour lives | O'Connor, Emmet | Article in Journal | | 1999 |
| Larkin, Connolly and the Cause of Labour | O'Connor, Emmet | Article in Book | | 2017 |
| Loyalism and labour in Belfast : the autobiography of Robert McElborough, 1884-1952 | | Monograph or Collective Volume | Cork University Press | 2002 |
| Max Levitas (1915-2018) communist and anti-fascist | O'Connor, Emmet | Article in Journal | | 2019 |
| Neither democratic nor a programme: the Democratic Programme of 1919 | O'Connor, Emmet | Article in Journal | | 2016 |
| Problems of Reform in the Irish Trades Union Congress, 1894-1914 | O'Connor, Emmet | Article in Journal | | 2007 |
| Reds and the green : Ireland, Russia and the communist internationals, 1919-43 | O'Connor, Emmet | Monograph or Collective Volume | University College Dublin | 2004 |
| Reds and the green : problems of the history and historiography of communism in Ireland | O'Connor, Emmet | Article in Journal | | 1997 |
| Rotten Prod : the unlikely career of Dongaree Baird | O'Connor, Emmet | Monograph or Collective Volume | University College Dublin Press | 2022 |
| Scotland and Ireland : labour directions
and radical connections | O'Connor, Emmet | Article in Journal | | 2015 |
| Seán Murray | O'Connor, Emmet | Article in Book | | 2016 |
| Sheep in wolves' clothing : labour and politics in Belfast, 1881-1914 | O'Connor, Emmet | Article in Book | | 2008 |
| Studies in irish radical leadership: lives on the left | | Monograph or Collective Volume | Manchester University Press | 2016 |
| Syndicalism in Ireland, 1917-1923 | O'Connor, Emmet | Monograph or Collective Volume | Cork University Press | 1988 |
| Taking its natural place: Labour and the third Home Rule crisis, 1912-1914 | O'Connor, Emmet | Article in Journal | | 2012 |
| The age of the red republic : the Irish left and Nationalism, 1909-36 | O'Connor, Emmet | Article in Journal | | 2005 |
| The influence of Redmondism on the development of the labour movement in Waterford in the 1890's | O'Connor, Emmet | Article in Journal | | 1979 |
| The Irish Labour History Society : an outline history | O'Connor, Emmet | Article in Journal | | 2010 |
| The labour movement in Waterford city 1913-1923 | O'Connor, Emmet | Article in Journal | | 1981 |
| The pioneers : Big Jim Larkin | O'Connor, Emmet | Article in Book | | 2013 |
| The reformation of the labour movement in Waterford : from new model unionism to Larkinism | O'Connor, Emmet | Article in Journal | | 1979 |
| The working class movement library Manchester | O'Connor, Emmet | Article in Journal | | 1982 |
| The world of labour in the early nineteenth century | O'Connor, Emmet | Article in Book | | 2002 |
| Trade unions and 1968 | O'Connor, Emmet | Article in Book | NA | 2009 |
| Trades councils in Waterford city | O'Connor, Emmet | Article in Book | | 1992 |
| True Bolsheviks? the rise and fall of the Socialist Party of Ireland, 1917-21 | O'Connor, Emmet | Article in Book | | 2004 |
| Tyrone volunteers in the Connolly Column in the Spanish Civil War | O'Connor, Emmet | Article in Journal | | 2017 |
| War and syndicalism 1914-1923 | O'Connor, Emmet | Article in Book | | 1994 |
| Waterford and IRA gun-running, 1917-22 | O'Connor, Emmet | Article in Journal | | 2001 |
| What Caused the 1913 Lockout? Industrial Relations in Ireland, 1907-13 | O'Connor, Emmet | Article in Journal | | 2005 |
| William Walker – A Connolly for Unionists? | O'Connor, Emmet | Article in Book | | 2017 |
| William Walker, Irish labour and 'Chinese slavery' in South Africa, 1904-6 | O'Connor, Emmet | Article in Journal | | 2010 |
| ‘What the hell do they want a republic for?’ Labour, the left and the Irish Civil War | O'Connor, Emmet | Article in Book | Cork University Press | 2024 |