- Orlando Bloom (9 movies)
- Orlando Brown (1 movie)
- Orlando Smart (1 movie)
- Orly Schuchmacher (2 movies)
- Orso Maria Guerrini (1 movie)
- Oscar Isaac (8 movies)
- Óscar Jaenada (1 movie)
- Oskar Belton (1 movie)
- Oskar Bökelmann (1 movie)
- Ot Palapoo (1 movie)
- Otakuye Conroy (1 movie)
- Otto Sanchez (1 movie)
- Ove Sprogøe (2 movies)
- Owen Masterson (1 movie)
- Owen Wilson (3 movies)