- Henry O
- Adam O'Brian
- Austin O'Brien
- Conan O'Brien
- Tom O'Brien
- Mark O'Brien
- Gerry O'Brien
- Pat O'Brien
- Donald O'Brien
- Edmond O'Brien
- Paul O'Brien
- Peter O'Brien
- Dylan O'Brien
- Chris O'Brocki
- Sean O'Bryan
- Patrick O'Bryan
- Sam O'Byrne
- Brian F. O'Byrne
- Brendan O'Carroll
- Mike O'Connell
- Charlie O'Connell
- Jack O'Connell
- Jerry O'Connell
- Kevin J. O'Connor
- Darren O'Connor
- Donald O'Connor
- Derrick O'Connor
- Pat O'Connor
- Simon O'Connor
- Josh O'Connor
- Hugh O'Conor
- Bryan O'Dell
- Alex O'Dogherty
- Chris O'Donnell
- David O'Donnell
- Cathy O'Donnell
- Keir O'Donnell
- Patrick O'Donnell
- Colin O'Donoghue
- Chris O'Dowd
- Simon O'Driscoll
- Conor O'Farrell
- Dean O'Gorman
- Mickey O'Hagan
- Brian O'Halloran
- Mark O'Halloran
- Ardal O'Hanlon
- Conor O'Hanlon
- David O'Hara
- Brian O'Hara
- Denis O'Hare
- Damian O'Hare
- Michael O'Hear
- Jim O'Heir
- Dan O'Herlihy
- Gavan O'Herlihy
- John O'Hurley
- Brock O'Hurn
- Patrick O'Kane
- Michael O'Keefe
- Matt O'Leary
- Colm O'Leary
- Chris O'Leary
- Tim O'Leary
- Peter O'Leary
- Alex O'Loughlin
- Benjamin O'Mahony
- Mike O'Malley
- J. Pat O'Malley
- Jason O'Mara
- Shane O'Meara
- Peter O'Meara
- Ryan O'Nan
- Patrice O'Neal
- Ryan O'Neal
- Patrick O'Neal
- Shaquille O'Neal
- Ron O'Neal
- Chris O'Neil
- Kel O'Neill
- Tommy O'Neill
- Nigel O'Neill
- Daniel O'Neill
- Con O'Neill
- Ryan O'Quinn
- Tommy O'Reilly
- Stephen O'Reilly
- Brian O'Shaughnessy
- James O'Shea
- Fionn O'Shea
- Milo O'Shea
- Billy O'Sullivan
- Ben O'Toole
- Peter O'Toole
- Mimoun Oaïssa
- Brandon Oakes
- David Oakes
- Simon Oakland
- Travis Oates
- Warren Oates
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1.0m
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35k
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