| Fifty years of concessions to Ireland, 1831-1881. 2 vols. | O'Brien, R. B. | Monograph or Collective Volume | | 1883 |
| Home Rule, speeches of John Redmond, M.P. | O'Brien, R. B.Redmond, John | Monograph or Collective Volume | Fisher Unwin | 1910 |
| Life and Letters of Thomas Drummond | O'Brien, R. B. | Monograph or Collective Volume | | 1889 |
| Studies in Irish history, 1649-1775 | | Monograph or Collective Volume | [s.n.] | 1903 |
| The autobiography of Theobald Wolfe Tone, 1763-98. 2 vols. | | Monograph or Collective Volume | | 1911 |
| The life of Lord Russell of Killowen | O'Brien, R. B. | Monograph or Collective Volume | | 1901 |
| The parliamentary history of the Irish land question from 1829 to 1869, and the origin and results of the Ulster custom | O'Brien, R. B. | Monograph or Collective Volume | | 1880 |
| The parliamentary history of the Irish land question from 1829-1869 | O'Brien, R. B. | Monograph or Collective Volume | | 1880 |