| A new Irish fragment of the continuatio to Rufinus-Eusebius Historia Ecclesiastica | Breen, Aidan | Article in Journal | | 1987 |
| A portrait of monastic Wexford | Breen, Aidan | Article in Journal | | 2006 |
| A propos du synode de Whitby. Étude des observations astronomiques dans les Annales Irlandaises | Breen, AidanMc Carthy, Daniel P., 1945- | Article in Journal | | 2000 |
| A re-evaluation of the Eastern and Western records of the Supernova of 1054 | Breen, AidanMc Carthy, Daniel P., 1945- | Article in Journal | | 1995 |
| Ailerani interpretatio mystica et moralis progenitorum Domini Iesu Christ | | Monograph or Collective Volume | Four Courts | 1995 |
| An evaluation of astronomical observations in the Irish annals | Breen, AidanMc Carthy, Daniel P., 1945- | Article in Journal | | 1997 |
| Astronomical observations in the Irish annals and their motivation | Breen, AidanMc Carthy, Daniel P., 1945- | Article in Journal | | 1997 |
| Columbanus' monastic life and education in Ireland | Breen, Aidan | Article in Journal | | 2011 |
| De XII Abusiuis : text and transmission | Breen, Aidan | Article in Book | | 2002 |
| Embellishing history | Breen, Aidan | Article in Journal | | 2010 |
| Iduma (Idouma) | Breen, Aidan | Article in Journal | | 1990 |
| Johannes Scottus, Periphyseon : the problems of an edition | Breen, Aidan | Article in Journal | | 1991 |
| Pseudo-Cyprian De Duodecim Abusivis Saeculi and the Bible | Breen, Aidan | Article in Book | | 1987 |
| Some seventh-century Hiberno-Latin texts and their relationships | Breen, Aidan | Article in Journal | | 1984 |
| St Senán : early monastic Enniscorthy | Breen, Aidan | Article in Book | | 2010 |
| The ante-Nicene Christian Pasch : De Ratione Paschali - the Paschal tract of Anatolius, bishop of Laodicea | Anatolius, Saint, Bishop of Laodicea. | Monograph or Collective Volume | Four Courts | 2003 |
| The Biblical text and sources of the Würzburg Pauline glosses (Romans 1-6) | Breen, Aidan | Article in Book | | 1996 |
| The evidence of antique Irish exegesis in pseudo-Cyprian, De duodecim abusivis saeculi | Breen, Aidan | Article in Journal | | 1987 |
| The history and ministration of the Gorey Poor Law Society 1840-49. A case-study in the operations of the Irish Poor Law | Breen, Aidan | Article in Journal | | 2007 |
| The Hugh Jackson Lawlor archive in the Representative Church Body Library [with index | Breen, Aidan | Article in Journal | | 2013 |
| The laws of the Irish | Breatnach, LiamBreen, AidanÓ Corráin, Donnchadh | Article in Journal | | 1984 |
| The text of the Constantinopolitan creed in the Stowe missal | Breen, Aidan | Article in Journal | | 1990 |
| Towards a critical edition of De XII abusivis: introductory essays wit a provisional edition of the text and accompanied by an English translation | Breen, Aidan | Thesis | | 1988 |