| A family of Mahony in Cos. Kerry and Limerick | De Breffny, Brian | Article in Journal | | 1981 |
| Ambrose O'Higgins : An Enquiry into his Origins and Ancestry | de Breffny, Brian | Article in Journal | | 1970 |
| An Elizabethan political painting | De Breffny, Brian | Article in Journal | | 1984 |
| An investigation into the Connacht ancestry of Mary Ann Costello, mother of George Canning | De Breffny, Brian | Article in Journal | | 1980 |
| Bevan of Co. Limerick | De Breffny, Brian | Article in Journal | | 1974 |
| Bibliography of Irish family history and genealogy | | Monograph or Collective Volume | Golden Eagle Books | 1974 |
| Bickerstaff of Glenavy parish, Co. Antrim | De Breffny, Brian | Article in Journal | | 1977 |
| Businessmen who issued tokens in Ireland, 1653-79 | De Breffny, Brian | Article in Journal | | 1978 |
| Castles of Ireland. Photographs by George Mott | De Breffny, Brian | Monograph or Collective Volume | Thames & Hudson | 1977 |
| Caters of Irish Quarter, Carrickfergus, Co. Antrim | De Breffny, Brian | Article in Journal | | 1978 |
| Caters of the Irish Quarter : Carrickfergus, Co. Antrim | De Breffny, Brian | Article in Journal | | 1978 |
| Crone of Co. Cork | De Breffny, Brian | Article in Journal | | 1969 |
| Earbery of Ballincollig and Shandangan, Co. Cork | De Breffny, Brian | Article in Journal | | 1981 |
| Employees of the Irish revenue in 1709 | De Breffny, Brian | Article in Journal | | 1974 |
| Extracts from admiralty passing certificates 1802-1808 | De Breffny, BrianPublic Record Office | Article in Journal | | 1967 |
| Gurly of Wexford and Carlow : the maternal lineage of George Bernard Shaw | De Breffny, Brian | Article in Journal | | 1978 |
| Heritage of Ireland | De Breffny, Brian | Monograph or Collective Volume | Weidenfeld and Nicolson | 1980 |
| Humphry's of Knockfad, Co. Cavan | De Breffny, Brian | Article in Journal | | 1981 |
| Ireland : a cultural encyclopaedia | | Monograph or Collective Volume | Thames & Hudson | 1983 |
| Irish family names : arms, origins, and locations | De Breffny, Brian | Monograph or Collective Volume | Gill & Macmillan | 1982 |
| Irish soldiers stationed on the coast of Coromandel in India on 31st December 1766 | De Breffny, Brian | Article in Journal | | 1984 |
| Letters from Connaught to a Wild Goose | De Breffny, Brian | Article in Journal | | 1978 |
| Letters to John Crone of Doneraile, Co. Cork, 1763-1781 | De Breffny, Brian | Article in Journal | | 1982 |
| Lost estates and vanished glories | De Breffny, Brian | Article in Journal | | 1985 |
| Magistrates of Co. Clare in 1792 | De Breffny, Brian | Article in Journal | | 1975 |
| Members of two Dublin societies in 1772 | De Breffny, Brian | Article in Journal | | 1981 |
| Monckton of Co. Limerick | De Breffny, Brian | Article in Journal | | 1972 |
| Pupils of Samuel Whyte's school in Dublin listed by him in 1772 | De Breffny, Brian | Article in Journal | | 1980 |
| Robert Craige's Co. Cavan tenants | De Breffny, Brian | Article in Journal | | 1976 |
| Robert Fagan, artist | De Breffny, Brian | Article in Journal | | 1971 |
| Roundwood and the Sharps | De Breffny, Brian | Article in Journal | | 1977 |
| Scanlon of the barony of Upper Connello, Co. Limerick | De Breffny, BrianEvers, Alicia E. | Article in Journal | | 1972 |
| Speranza's ancestry : Elgee - the maternal lineage of Oscar Wilde | De Breffny, Brian | Article in Journal | | 1972 |
| Spread of Co. Cork | De Breffny, Brian | Article in Journal | | 1970 |
| Stucco work by Patrick Osborne at Castletown Cox | De Breffny, Brian | Article in Journal | | 1981 |
| The American sailor who succeeded to an Irish peerage | De Breffny, Brian | Article in Journal | | 1972 |
| The churches and abbeys of Ireland | De Breffny, BrianMott, George | Monograph or Collective Volume | Thames & Hudson | 1976 |
| The end of the old order : from the Reformation to the Jacobite defeat | de Breffny, Brian | Article in Book | | 1977 |
| The family of Odell or O'Dell | De Breffny, Brian | Article in Journal | | 1971 |
| The houses of Ireland : domestic architecture from the medieval castle to the Edwardian villa | De Breffny, BrianFfolliott, Rosemary | Monograph or Collective Volume | Thames & Hudson | 1975 |
| The Irish world : the history and cultural achievements of the Irish people | | Monograph or Collective Volume | Thames & Hudson | 1977 |
| The Lafranchini brothers | De Breffny, Brian | Article in Journal | | 1988 |
| The land of Ireland | De Breffny, BrianMott, George | Monograph or Collective Volume | Thames & Hudson | 1979 |
| The Pembertons of Dublin | De Breffny, Brian | Article in Journal | | 1979 |
| The Peppards of Cappagh, Co. Limerick | De Breffny, Brian | Article in Journal | | 1984 |