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O'Carroll is an Irish surname. Notable people who use this name include:

Surnames

Brendan O'Carroll (born 1955), Irish actor, comedian, director, producer and writer
Daniel O'Carroll (died 1713), British army officer
Diarmuid O'Carroll (born 1987), Irish footballer
Eamon O'Carroll (born 1987), Irish rugby footballer
Fintan O'Carroll (1922–1981) (also known by his Irish name Fiontán P Ó Cearbhaill), Irish composer
Gay O'Carroll(born 1964), Irish footballer
John O'Carroll (born 1958), British artist
Joseph O'Carroll (1891–1965), Australian politician
Maggie O'Carroll, British business leader
Michael O'Carroll (1911–2004), Irish motoring expert and TV/radio/newspaper correspondent
Paddy O'Carroll (hurler) (1866–1960), Irish hurler
Paddy O'Carroll (swimmer) (fl. 1986), New Zealand swimmer
Richard O'Carroll (1876–1916), Irish patriot and union Leader
Rory O'Carroll (born 1989), Irish footballer and hurler
Ross O'Carroll (born 1987), Irish hurling and football player
Sinéad O'Carroll (born 1973), Irish singer and businesswoman
Susie O'Carroll (b 1987), Irish sportsperson
Tom O'Carroll (born 1945), British writer and paedophilia advocate
William Augustine O'Carroll (1831–1885), Irish nationalist, radical liberal, journalist and Queensland newspaper editor