| Big Biddy Higgins | O'Brien, Pat | Article in Journal | | 2002 |
| Castledargan : a middle-sized Sligo landed estate | O'Brien, Patrick E. | Article in Book | | 2024 |
| Collected thoughts on the salt industry and Sligo: 1700-1850 | O'Brien, Patrick E. | Article in Journal | | 2016 |
| Desmond Arthur 'The Montrose Ghost' | O'Brien, Patrick | Article in Journal | | 1994 |
| Dr. Butler and the Jerusalem pony | O'Brien, Pat | Article in Journal | | 2001 |
| Dunamase - the 'Acropolis' of Laois | O'Brien, Patrick Pascal | Article in Journal | | 2006 |
| Fenian and famous war correspondent : Edmond O'Donovan | O'Brien, Patrick | Article in Journal | | 1991 |
| Fenloe : a graveyard and a legend | O'Brien, Patrick | Article in Journal | | 1978 |
| John Longfield of Mallow and Cloyne - a narrative | O'Brien, Pat | Article in Journal | | 2018 |
| Kilross Civil Parish in 1749: a microcosm of 18th-century Sligo? | O'Brien, Pat | Article in Journal | | 2018 |
| Luggala during the Famine years | O'Brien, Pat | Article in Journal | | 2003 |
| Recollections of the Famine | O'Brien, Pat | Article in Journal | | 2005 |
| Roundwood at the start of World War II | O'Brien, Patrick | Article in Journal | | 1996 |
| Scottish, Irish, and imperial connections : Parliament, the three kingdoms, and the mechanization of cotton spinning in eighteenth-century Britain | Griffiths, TrevorHunt, PhilipO'Brien, Patrick Karl, 1932- | Article in Journal | | 2008 |
| Sligo's de Burgo castle of 1310 : an addendum | O'Brien, Patrick E.Timoney, Martin A. | Article in Book | | 2002 |
| The Bentley family of Hurdlestown, Co. Clare | O'Brien, Patrick | Article in Journal | | 1986 |
| The famine in Broadford parish | O'Brien, Patrick | Article in Journal | | 1993 |
| The first forty years : C.L.C.G., Cumann Peile an Athar Ó Griobhtha (Gaillimh) : a history of the Fr. Griffin Gaelic football club and juvenile wing - St Augustine's | | Monograph or Collective Volume | Father Griffin Gaelic Football Club | 1991 |
| The Royal visit | O'Brien, Pat | Article in Journal | | 1997 |
| Trades and customs of nineteenth century | O'Brien, Patrick | Article in Journal | | 1983 |
| W.J. Duffy | O'Brien, Patrick | Article in Journal | | 1996 |