Roger O'Shaughnessy, The O'Shaughnessy (died 1690), was a Captain in the Irish army of James II of England. He was present at the Battle of the Boyne, dying ten days after. In 1697 Roger's estates were granted to Sir Thomas Prendergast, 1st Baronet, and the O'Shaughnessy family were never able to recover them.
- D'Alton, John, Illustrations, Historical and Genealogical, of King James's Irish Army List (1689). Dublin: 1st edition (single volume), 1855. pp. 328–32.
- O'Donovan, John. The Genealogies, Tribes, and Customs of Hy-Fiachrach. Dublin: Irish Archaeological Society. 1844. Pedigree of O'Shaughnessy: pp. 372–91.
- O'Hart, John, Irish Pedigrees. Dublin: James Duffy and Co. 5th edition, 1892. pp. 754–6
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