| "A look into the past" : our Irish heritage | | Monograph or Collective Volume | Knock Shrine Publications | 1990 |
| A life of Patrick Cardinal O'Donnell | Gallagher, John P. | Thesis | | 1975 |
| Comóradh Pheadair Uí Dhubhda - Mar a tharla | Gallagher, Johnny | Article in Journal | | 2020 |
| Conflict and tragedy in Napoleon's Irish legion : the Corbet/Sweeny affair | Gallagher, John G. | Article in Journal | | 1986 |
| Connacht : a heritage to explore | | Monograph or Collective Volume | Fiona Books | 1994 |
| Courageous Irishwomen | Gallagher, John | Monograph or Collective Volume | Fiona Books | 1995 |
| Irish patriot and Napoleonic soldier, William Lawless | Gallagher, John | Article in Journal | | 1992 |
| Nationalisms and the Crisis of Empire, 1919-1922 | Gallagher, John Andrew, 1919-1980 | Article in Journal | | 1981 |