| 'Prudentia et Fortitudine' in the Tudor period. The O'Reillys: an analysis of annalistic evidence (1100-1600 A.D.) | O'Reilly, Patrick J. | Article in Journal | | 2015 |
| A genealogical history of the O'Reillys, written in the eighteenth century by E. Ó Raghallaigh, and incorporting portion of the earlier work of T. Fitzsimons, Vicar General of the diocese of Kilmore | Carney, James Patrick, 1914-1989Ó Raghallaigh, Eóghan | Monograph or Collective Volume | An Cumann Seanchais Bhreifne | 1959 |
| A Mossley mystery (Ashton-under-Lyne Manchester England) | O'Reilly, Séamus | Article in Journal | | 2017 |
| A ninth-century Uí Briúin settlement in County Cavan | Smith, Tom | Article in Journal | | 2017 |
| An archaeological assessment of Kilmore Old Cathedral, County Cavan | Giacometti, Antoine ; Cronin, John J. ; Hughes, Sam | Article in Book | Cumann Seanchais Bhreifne | 2025 |
| An O'Reilly genealogy | O'Connell, Philip | Article in Journal | | 1963 |
| History of George's Place and the Reillys | O'Reilly, G. H. | Article in Journal | | 1999 |
| John O'Clery, 1778-1846 | Ó Lochlainn, Colm, 1892-1972 | Article in Journal | | 1946 |
| Myles son of Philip O'Reilly of Dunmurry | Moore, Eoghan | Article in Journal | | 2018 |
| Origin of the O'Reillys and a history of the sept | Mathews, Anthony | Monograph or Collective Volume | Mathews | 1970 |
| Reilly of Ballintlea | Reilly, Joseph F. | Monograph or Collective Volume | The author | 1981 |
| Roasting a man alive : the case of Mary Rielly, criminal lunatic | Prior, Pauline M. | Article in Journal | | 2006 |
| The Anglicisation of East Breifne : the O'Reillys and the emergence of County Cavan | Cunningham, Bernadette | Article in Book | | 1995 |
| The Birmingham pub bombings, the Irish as a 'suspect community' and the memories of the O'Reilly family | O'Reilly, Laura | Article in Book | | 2017 |
| The end of the O'Reilly lordship, 1584-1610 | Brady, Ciarán | Article in Book | | 2004 |
| The gentlemen O'Reillys of the old family | Curran, Mary T.
| Article in Journal | | 2017 |
| The history of Breifne O'Reilly | O'Reilly, J. J. | Monograph or Collective Volume | Vantage P. | 1976 |
| The last days of William Bedell in early-modern Irish history and memory | Darcy, Eamon | Article in Book | Cumann Seanchais Bhreifne | 2025 |
| The line of Colonel John O'Reilly | O'Connell, Philip | Article in Journal | | 1962 |
| The O'Reillys and McQuaids of Lisdoagh | McKiernan, Francis | Article in Journal | | 1991 |
| The O'Reillys of Annagh | O'Reilly, Hugh | Article in Journal | | 1986 |
| The O'Reillys of Corlattyannan and their relations | McKiernan, Francis | Article in Journal | | 1994 |
| The O'Reillys of east Breifne and the problem of "Surrender and Regrant" | Brady, Ciaran F. | Article in Journal | | 1985 |
| The O'Reillys of east Breifne, c.1250-c.1450 | Parker, Kieran | Article in Journal | | 1991 |
| The Park ''Without Care', 'Sans Souci' Booterstown | Clancy, Ciarán | Article in Journal | | 2021 |