| Approaches to the history of fourteenth-century Ireland | Watt, J. A. | Article in Book | | 1987 |
| Dublin in the thirteenth century : the making of a colonial capital city | Watt, J. A. | Article in Book | | 1986 |
| Ecclesia inter Anglicos et Hibernicos : confrontation and coexistence in the medieval diocese and province of Armagh | Watt, J. A. | Article in Book | | 1984 |
| English law and the Irish church : the reign of Edward I | Watt, J. A. | Article in Book | | 1961 |
| Gaelic polity and cultural identity | Watt, J. A. | Article in Book | | 1987 |
| John Colton, justiciar of Ireland (1382) and archbishop of Armagh (1383-1404) | Watt, J. A. | Article in Book | | 1981 |
| Laudabiliter in medieval diplomacy and propaganda | Watt, J. A. | Article in Journal | | 1957 |
| Laudabiliter in medieval diplomacy and propaganda | Watt, J. A. | Article in Journal | | 1957 |
| Medieval studies presented to Aubrey Gwynn, S.J. | | Monograph or Collective Volume | Three Candles | 1961 |
| Negotiations between Edward II and John XXII concerning Ireland | Watt, J. A. | Article in Journal | | 1956 |
| Pope John XXII, King Edward and Ireland | Watt, J. A. | Article in Journal | | 1956 |
| The Anglo-Irish colony under strain, 1327-99 | Watt, J. A. | Article in Book | | 1987 |
| The church and the two nations in late-medieval Armagh | Watt, J. A. | Article in Book | | 1989 |
| The Church and the two nations in medieval Ireland | Watt, J. A. | Monograph or Collective Volume | University P. | 1970 |
| The disputed primacy of the medieval Irish church | Watt, J. A. | Article in Book | | 1988 |
| The first recorded use of the word 'parliament' in Ireland? | Watt, J. A. | Article in Journal | | 1969 |
| The medieval chapter of Armagh Cathedral | Watt, J. A. | Article in Book | | 1992 |
| The papacy and episcopal appointments in thirteenth-century Ireland | Watt, J. A. | Article in Journal | | 1959 |
| The papacy and Ireland in the fifteenth century | Watt, J. A. | Article in Book | | 1984 |