- O Brother, Where Art Thou?
- Object of My Affection, The
- Ocean's Eleven (2001)
- Ocean's Thirteen
- Ocean's Twelve
- Office Space
- Officer and a Gentleman, An
- Oklahoma! (1955)
- Oldboy
- Old School
- Oliver & Company
- Omega Man, The
- Omen, The
- Omen, The (2006)
- Omkara
- On Golden Pond
- On Her Majesty's Secret Service
- On Moonlight Bay
- Once Upon a Time in America
- Once Upon a Time in Mexico
- Once Upon a Time in the West
- Once Were Warriors
- One Flew Over the Cuckoo's Nest
- One Hundred and One Dalmatians
- One Magic Christmas
- Only You (1994)
- Open Season
- Open Season 2
- Opening of Misty Beethoven, The
- Operation Dumbo Drop
- Opposite of Sex, The
- Orange County
- Orgazmo
- Original Sin
- Osmosis Jones
- Other Guys,The
- Other Boleyn Girl, The
- Out of Sight
- Out of the Past
- Outbreak
- Outlaw Josey Wales, The
- Outside Providence
- Over the Hedge
- Oz the Great and Powerful
