| A pugilistic contest held at Bottle Hill 1821 based on contemporary newspaper accounts | O'Regan, John | Article in Journal | | 2018 |
| Countering the revolutionaries: an examination of the Cumann na nGaedheal party, 1922-25 | Regan, John | Thesis | | 1994 |
| Descendancy: Irish Protestant histories since 1795 [by] David Fitzpatrick. Cambridge University Press, [2015] | Regan, John M. | Article in Journal | | 2015 |
| Dr Jekyll and Mr Hyde: 'the two histories' | Regan, John M., 1967- | Article in Journal | | 2012 |
| Great Hatred. The assassination of Field Marshal Air Henry Wilson MP, [by] Ronan McGreevy. London, 2022 | Regan, John M. | Article in Journal | | 2022 |
| Introduction | Cronin, MikeRegan, John M., 1967- | Article in Book | | 2000 |
| Ireland : the politics of independence, 1922-49 | | Monograph or Collective Volume | Macmillan | 2000 |
| Irish public histories as an historiographical problem | Regan, John M., 1967- | Article in Journal | | 2010 |
| John T. Davis | Davis, John T., 1947-O'Regan, John, 1958- | Monograph or Collective Volume | Gandon Editions | 1993 |
| Kevin O'Higgins, Irish republicanism and the conservative counter-revolution | Regan, John M., 1967- | Article in Book | | 1999 |
| Kindling the Singing Flame : The destruction of the Public Record Office (30 June 1922), as a historical problem | Regan, John M. | Article in Book | | 2016 |
| Kindling the Singing Flame: the destruction of the Public Record Office (30 June 1922) as a historical problem | Regan, John M. | Article in Journal | | 2015 |
| Latin scholars, wattle stick fightetrs, lice and stormy weather: some of the experiences of an English government official, James Weale, on his first visit to Sliabh Luachra in April 1828 | O'Regan, John | Article in Journal | | 2023 |
| Looking at Mick again : demilitarising Michael Collins | Regan, John M., 1967- | Article in Journal | | 1995 |
| Michael Canning | Scott, Yvonne | Monograph or Collective Volume | Gandon Press | 2008 |
| Michael Collins - the legacy and the intestacy | Regan, John M., 1967- | Article in Book | | 1998 |
| Michael Collins, General Commanding-in-Chief, as a historiographical problem | Regan, John M., 1967- | Article in Journal | | 2007 |
| Myth and the Irish state : historical problems and other essays | Regan, John M., 1967- | Monograph or Collective Volume | Irish Academic Press | 2013 |
| Private Paddy Hassett and World War I | O'Regan, John | Article in Journal | | 2016 |
| Public works : the architecture of the office of public works, 1831-1987 | | Monograph or Collective Volume | Architectural Association of Ireland | 1987 |
| Southern Irish nationalism as a historical problem | Regan, John M., 1967- | Article in Journal | | 2007 |
| Strangers in our midst : middling people, revolution and counter-revolution in twentieth-century Ireland | Regan, John M., 1967- | Article in Journal | | 2001 |
| The 'Bandon Valley Massacre' as a historical problem | Regan, John M., 1967- | Article in Journal | | 2012 |
| The Irish counter-revolution 1921-1936 : treatyite politics and settlement in independent Ireland | Regan, John M., 1967- | Monograph or Collective Volume | Gill & Macmillan | 1999 |
| The Kilmichael ambush and the outer limits of Irish historical revisionism | Regan, John | Article in Journal | | 2020 |
| The memoirs of John M. Regan : a Catholic officer in the RIC and RUC, 1909-1948 | Regan, John M., 1889-1971 | Monograph or Collective Volume | Four Courts | 2007 |
| The politics of reaction : the dynamics of treatyite government and policy, 1922-33 | Regan, John M., 1967- | Article in Journal | | 1997 |
| The politics of utopia : party politics, executive autonomy and the new administration | Regan, John M., 1967- | Article in Book | | 2000 |
| The “O'Brien ethic” as an interpretative problem | Regan, John M. | Article in Journal | | 2013 |