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

 Collegeland O'Rahilly's GAA, a Gaelic Athletic Association club on the Armagh-Tyrone border just outside Charlemont and the Moy
 Kerins O'Rahilly's GAA, a Gaelic Athletics Association club based in Tralee, County Kerry

People with the surname
 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

Surnames of Irish origin