O'Rahilly (Irish: Ó Raithile) is an Irish surname and may refer to:

People with the surname

edit
  • Alfred O'Rahilly (1884–1969), Irish academic, Teachta Dála, and president of University College Cork
  • Aogán Ó Rathaille or Egan O'Rahilly (1670–1727), Irish language poet
  • Cecile O'Rahilly (1894–1980), Irish scholar of the Celtic languages
  • Helen O'Rahilly, Irish television executive
  • Michael Joseph O'Rahilly (1875–1916), self-described as The O'Rahilly, Irish republican who took part in the Easter Rising
  • Ronan O'Rahilly (born 1940), Irish businessman and creator of Radio Caroline
  • Stephen O'Rahilly (fl. 2006), Irish-British physician and scientist
  • T. F. O'Rahilly, (1883–1953), Irish scholar of the Celtic languages