| "Elevating the profession" : the Institute of Chartered Accountants in Ireland and the implementation of social closure strategies 1888-1909 | O'Regan, Philip | Article in Journal | | 2008 |
| Archbishop William King of Dublin (1650-1729) and the constitution in church and state | O'Regan, Philip | Monograph or Collective Volume | Four Courts | 2000 |
| Dear old Skibbereen : a glimpse of conditions in this town during the great Irish famine | | Monograph or Collective Volume | [s.n.] | 1995 |
| Gearóid Ó Súilleabháin: Brave and faithful soldier of Ireland, whose life was devoted to the service of his country, in war and in peace | O'Regan, Philip | Article in Journal | | 2016 |
| Jeremiah O’Donovan Rossa : the most typical Fenian of them all | O'Regan, Philip | Article in Journal | | 2015 |
| John Francis Levis: The man who saved 'Skibbereen' | O'Regan, Philip | Article in Journal | | 2018 |
| Origins of Saint Patrick's Cathedral, Skibbereen | O'Brien, GeraldO'Regan, Philip | Article in Journal | | 2018 |
| The G.A.A. - early days in Skibbereen and nationally | O'Regan, Philip | Article in Journal | | 2005 |
| William King as bishop and parliamentarian, 1691-7 | O'Regan, Philip | Article in Book | | 2004 |
| ‘A dense mass of petty accountability’: Accounting in the service of cultural imperialism during the Irish Famine, 1846–1847 | O'Regan, Philip | Article in Journal | | 2010 |