- O (Othello) (2001)
- O Brother, Where Art Thou? (2000)
- O Gebo e a Sombra (Gebo and the Shadow) (2012)
- O Homem do Ano (The Man of the Year) (2003)
- O Homem do Futuro (2011)
- O kalyteros mou filos (My Best Friend) (2001)
- O Lucky Malcolm! (2006)
- O Lucky Man! (1973)
- O Menino da Porteira (2009)
- O Teri (2014)
- O-Bi, O-Ba: The End of Civilization (1985)
- O-jik geu-dae-man (Always AKA Only You) (2011)
- O-ssak-han Yeon-ae (Chilling Romance) (2011)
- O. Henry's Full House (1952)
- O.G. (2018)
- O.J. Speaks: The Hidden Tapes (2015)
- Oasis (2002)