| "Looking at the state they're in" : the Irish country house at the birthing of a nation | O'Reilly, Seán | Article in Book | Department for Continuing Education, Oxford University | 2000 |
| A slow awakening from a deep slumber | O'Reilly, Seán | Article in Book | | 2002 |
| Adolescent architecture and after. The formative years of Timothy Hevey (1846-78) | O'Reilly, Seán | Article in Journal | | 1996 |
| Arklow merchant marine sailors lost during World War II | O'Reilly, Seán | Article in Journal | | 2008 |
| Birth of a nation's symbol : the revival of Ireland's round towers | O'Reilly, Seán | Article in Journal | | 1999 |
| British Paints (Ireland) Ltd | O'Reilly, Seán | Article in Journal | | 2008 |
| Charlemont House : a critical history | O'Reilly, Seán | Article in Book | | 2008 |
| Cool metal, clear water : trading boats of Ireland's inland waterways | | Monograph or Collective Volume | Heritage Boat Association | 2006 |
| Early, modern and late : Scott Tallon Walker | O'Reilly, Seán | Article in Journal | | 2006 |
| Forgotten holy wells | O'Reilly, Seán | Article in Journal | | 1988 |
| Irish churches and monasteries : an historical and architectural guide | O'Reilly, Sean D. | Monograph or Collective Volume | Collins Press | 1997 |
| Irish houses and gardens : from the archives of Country Life | O'Reilly, Sean D. | Monograph or Collective Volume | Aurum Press | 1998 |
| John Tyrrell and sons. | O'Reilly, Seán | Article in Journal | | 2008 |
| Lucan House, Co. Dublin | O'Reilly, SeánRowan, Alistair | Monograph or Collective Volume | Eason | 1988 |
| Mallow miscellany | O'Reilly, Seán | Article in Journal | | 1984 |
| Newberry | O'Reilly, Seán | Article in Journal | | 1983 |
| Patrick Osborne, an Irish stuccadore | O'Reilly, Seán | Article in Journal | | 1989 |
| Picturesque moments at Powerscourt : issues in estate management for a burgeoning touring population | O'Reilly, Seán | Article in Book | | 1998 |
| Poor Palladian or not? Some alternative sources for the early Georgian villa in Ireland | O'Reilly, Seán | Article in Book | | 1996 |
| The Casino at Marino | O'Reilly, Seán | Monograph or Collective Volume | Office of Public Works | 1991 |
| The doctor Cronin story | O'Reilly, Seán | Article in Journal | | 1985 |
| The story of "musicals" in St. Mary's College | O'Reilly, Seán | Article in Journal | | 2004 |
| Tradition and transition : Castletown Cox and a moment in the slow demise of the great house | O'Reilly, Seán | Article in Book | | 1997 |
| University College Dublin | O'Reilly, SeánRowan, Alistair | Monograph or Collective Volume | Eason | 1990 |