| Admiral Robert O'Brien (1776-1838) | O'Brien, Ivor | Article in Journal | | 1992 |
| An inventory of the property of the late 5th Earl of Thomond | O'Brien, Ivor | Article in Journal | | 1995 |
| Lord Cornbury, governor of New York 1702-08, probably the first recorded transvestite in Anglo-American history | O'Brien, Ivor | Article in Journal | | 2000 |
| Murrough the burner : Murchadh na dTóiteán : a life of Murrough, sixth baron and first earl of Inchiquin, 1614-74 | O'Brien, Ivor | Monograph or Collective Volume | Ballinakella | 1991 |
| Rear-Admiral Lucius O'Brien, R.N. | O'Brien, Ivor | Article in Journal | | 1993 |
| The O'Briens of Dromore Castle | O'Brien, Ivor | Article in Journal | | 1987 |
| The will of the 8th earl of Thomond | O'Brien, Ivor | Article in Journal | | 1988 |