|Reference style||The Most Reverend|
|Spoken style||My Lord|
A native of the parish of Bailieborough in County Cavan, Ireland, he was the parish priest of Drumlane from 1790 to 1807. He was elected Bishop of the Diocese of Kilmore by the Sacred Congregation for the Propagation of the Faith on 4 October 1806 and was confirmed by Pope Pius VII on 14 December 1806. O'Reilly's papal brief to the See of Kilmore was dated 16 January 1807  and was consecrated on 24 August 1807 by the Most Reverend Richard O'Reilly, Archbishop of Armagh.
- "Folklore". Bailieborough.com. Retrieved 4 November 2013.
- Brady 1876, The Episcopal Succession, volume 1, p. 287.
- Moody, Martin & Byrne 1984, A New History of Ireland, volume IX, p. 350.
- "Bishop Fargal O'Reilly". Catholic-Hierarchy.org. David M. Cheney. Retrieved 4 November 2013.
- Fryde et al. 1986, Handbook of British Chronology, p. 436.
- Brady, W. Maziere (1876). The Episcopal Succession in England, Scotland and Ireland, A.D. 1400 to 1875. Volume 1. Rome: Tipografia Della Pace.
- Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). Cambridge: Cambridge University Press. ISBN 0-521-56350-X.
- Moody, T. W.; Martin, F. X.; Byrne, F. J., eds. (1984). Maps, Genealogies, Lists: A Companion to Irish History, Part II. A New History of Ireland. Volume IX. Oxford: Oxford University Press. ISBN 0-19-821745-5.
|Catholic Church titles|
|Bishop of Kilmore