| 'Exotic' ninth-to tenth-century cross-decorated stones from Clonmore, Co. Carlow and Begerin, Co. Wexford | Harbison, Peter | Article in Book | Galway University Press | 1988 |
| A note on the place-name 'Aranea' | Mac Niocaill, Gearóid | Article in Journal | | 1955 |
| À propos du vocabulaire social irlandais au bas moyen âge | Mac Niocaill, Gearóid | Article in Journal | | 1968 |
| A Viking Dublin perspective on Irish vernacular architecture studies | Wallace, Patrick F. | Article in Book | Galway University Press | 1988 |
| An unpublished fragment of the register of the hospital of St John the Baptist, Dublin | | Article in Journal | | 1962 |
| Annála gearra as proibhinse Ard Macha | | Article in Journal | | 1959 |
| Annala Uladh (to A.D. 1131), part 1 : text and translation | | Monograph or Collective Volume | Institute for Advanced Studies | 1983 |
| Annála Uladh agus Annála Locha Cé, 1014-1220 | Mac Niocaill, Gearóid | Article in Journal | | 1959 |
| Annals of Ulster (to A.D. 1131). Part 1 text and translation | | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1983 |
| Aspects of Irish law in the late thirteenth century | Mac Niocaill, Gearóid | Article in Book | | 1976 |
| BUPNS Reprints 26: A note on the place-name 'Aranea' | Mac Niocaill, Gearóid | Article in Journal | | 2008 |
| Cáipéisí dlí in nGaeilge, 1493-1621 | Mac Niocaill, Gearóid | Thesis | | 1961 |
| Cáipéisí Doimniceánacha ón 17ú céad | Mac Niocaill, Gearóid | Article in Journal | | 1958 |
| Cáipéisi ón gceathrú céad déag | | Article in Journal | | 1958 |
| Cairt le Walter de Lacy | Mac Niocaill, Gearóid | Article in Journal | | 1977 |
| Cairt ó Mhaolmhordha Ó Raighilligh, 1558 | Mac Niocaill, Gearóid | Article in Journal | | 1959 |
| Christian influences in early Irish law | Mac Niocaill, Gearóid | Article in Book | | 1984 |
| Crown surveys of lands, 1540-1541, with the Kildare rental begun in 1518 | | Monograph or Collective Volume | Irish Manuscripts Commission | 1992 |
| Dán do Chormac Mág Shamhradháin, easpag Ardachaidh 1444-?1476 | | Article in Journal | | 1961 |
| Die politische Szene Irlands im 8. Jahrhundert : Königtum und Herrschaft | Mac Niocaill, Gearóid | Article in Book | | 1985 |
| Documents relating to the suppression of the Templars in Ireland | | Article in Journal | | 1967 |
| Duanaire Ghearóid Iarla | | Article in Journal | | 1963 |
| Elenchus Fontium Historiae Urbanae, 2 pt. 2. | De Boer, W.Mac Niocaill, GearóidReynolds, S. | Monograph or Collective Volume | | 1988 |
| Gaelic Ireland to 1603 | Mac Niocaill, Gearóid | Article in Book | | 1981 |
| Investment in early Irish agriculture | Mac Niocaill, Gearóid | Article in Book | | 1982 |
| Ireland and continental Europe : the historical dimension | Mac Niocaill, GearóidÓ Tuathaigh, M. A. G. (Gearóid) | Article in Book | | 1984 |
| Ireland before the Vikings | Mac Niocaill, Gearóid | Monograph or Collective Volume | Gill & Macmillan | 1972 |
| Irish Law and the Armagh constitutions of 1297 | Mac Niocaill, Gearóid | Article in Journal | | 1971 |
| Irish population before Petty : problems and possibilities | Mac Niocaill, Gearóid | Monograph or Collective Volume | National University of Ireland | 1981 |
| Jetsam, treasure trove, and the lord's share in medieval Ireland | Mac Niocaill, Gearóid | Article in Journal | | 1971 |
| Keimelia : studies in medieval archaeology and history in memory of Tom Delaney | NA | Monograph or Collective Volume | Galway University Press. Officina Typographica | 1988 |
| Land-tenure in sixteenth century Thomond : the case of Domhnall Óg Ó Cearnaigh | Mac Niocaill, Gearóid | Article in Journal | | 1977 |
| Land-transfer in sixteenth-century Thomond : the case of Domhnall Óg Ó Cearnaigh | Mac Niocaill, Gearóid | Article in Journal | | 1977 |
| Meabhrán dlí ó Mhuintír Eolais, 1497-1513 | | Article in Journal | | 1957 |
| Medieval Galway : dependence and liberty | Mac Niocaill, Gearóid | Article in Book | | 1995 |
| Medieval Galway : its origins and charter | Mac Niocaill, Gearóid | Article in Book | | 1984 |
| Murder in a Dublin monastery, 1379 | Martin, F. X. (Francis Xavier), 1922-2000 | Article in Book | Galway University Press | 1988 |
| Na buirgéisí, XII-XV aois. 2 vols. | Mac Niocaill, Gearóid | Monograph or Collective Volume | Cló Morainn | 1964 |
| Na manaigh liatha in Éirinn, 1142-c.1600 | Mac Niocaill, Gearóid | Monograph or Collective Volume | Cló Morainn | 1959 |
| Na Manaigh Liatha sa 17ú céad : trí cáipéisí | Mac Niocaill, Gearóid | Article in Journal | | 1956 |
| Notes on litigation in later Irish Law | Mac Niocaill, Gearóid | Article in Journal | | 1967 |
| Notitiae as Leabhar Cheanannais 1033-1161 | Mac Niocaill, Gearóid, 1932-2004 | Monograph or Collective Volume | Cló Morainn | 1961 |
| Obligationes pro annatis diocesis Elphinensis, [1426-1548] | | Article in Journal | | 1959 |
| Register of St Saviour's chantry, Waterford | Mac Niocaill, Gearóid | Article in Journal | | 1966 |
| Registrum cantariae S. Salvatoris Waterfordensis : (B.M. Harl. 3765) | | Article in Journal | | 1966 |
| Seven Irish documents from the Inchiquin archives | | Article in Journal | | 1970 |
| Socio-economic problems of the late medieval Irish town | Mac Niocaill, Gearóid | Article in Book | | 1981 |
| Some coin names in Ceart Uí Néill | Dolley, MichaelMac Niocaill, Gearóid | Article in Journal | | 1967 |
| The "heir designate" in early medieval Ireland | Mac Niocaill, Gearóid | Article in Journal | | 1968 |
| The Annals of Ulster (to A.D. 1131); part 1 : Text and translation | | Monograph or Collective Volume | | 1983 |
| The Background of the Battle of Tarbga | Mac Niocaill, Gearóid | Article in Journal | | 1976 |
| The case of Nicholas John | Mac Niocaill, Gearóid | Article in Journal | | 1963 |
| The charters of John, lord of Ireland, to the see of Dublin | | Article in Journal | | 1964 |
| The colonial town in Irish documents | Mac Niocaill, Gearóid | Article in Book | | 1985 |
| The contact of Irish and common law | Mac Niocaill, Gearóid | Article in Journal | | 1972 |
| The interaction of laws | Mac Niocaill, Gearóid | Article in Book | | 1984 |
| The Irish-language manuscripts | Mac Niocaill, Gearóid | Article in Book | | 1986 |
| The legacy of the middle ages | Mac Niocaill, Gearóid | Article in Book | | 1988 |
| The medieval Irish annals | Mac Niocaill, Gearóid | Monograph or Collective Volume | Dublin Historical Association | 1975 |
| The medieval pottery of Dublin | Barton, K. J. | Article in Book | Galway University Press | 1988 |
| The origins of the betagh | Mac Niocaill, Gearóid | Article in Journal | | 1966 |
| The Red Book of the earls of Kildare | | Monograph or Collective Volume | | 1964 |
| The Red Book of the earls of Kildare | | Monograph or Collective Volume | Stationery Office for the Irish Manuscripts Commission | 1964 |
| Tír Cumaile | Mac Niocaill, Gearóid | Article in Journal | | 1971 |
| Trí hÓrmharg | Dolley, MichaelMac Niocaill, Gearóid | Article in Journal | | 1968 |
| Two Anglo-Saxon carved zoomorphic mounts from Dublin | Webster, Leslie | Article in Book | Galway University Press | 1988 |
| Uilliam Ó Raghallaigh, O.F.M. | Mac Niocaill, Gearóid | Article in Journal | | 1961 |