- O Brother, Where Art Thou?
- O Lucky Man!
- O. Henry's Full House
- O.B.A.M. Nude
- Obvious Child (2014)
- Ocean's 11 (1960)
- Ocean's Twelve
- Oconomowoc
- Oddball Hall
- Off Season: The Lex Morrison Story
- Office Ninja
- Office Romance, Part 1
- Office Romance, Part 2
- Office Space
- Oh God!
- Oh God! You Devil
- Oh My God (OMG)
- Oh, God! Book 2
- Oh, Mr. Porter
- Oishi High School Battle: Kawaii Collection Vol. 1
- OJ: The Musical
- OK Garage
- OK, Good
- Oklahoma Crude
- Oktapodi
- Old Bones of the River
- Old Dogs
- Old Goats
- Old School (Unrated) [2003]
- OMG/HaHaHa
- On a Clear Day You Can See Forever
- On Again-Off Again
- On Borrowed Time
- On Location with George Carlin
- On Strike for Christmas
- On the Double
- On the Fiddle
- On the Town (1949)
- Once Bitten
- Once Upon a Crime
- Once Bitten
- Once Upon a Crime
- Once Upon a Honeymoon (1942)
- Once Upon a Mattress
- Once Upon a Time
- One By Two
- One for the Money
- One Last Thing…
- One Night In Powder
- One of Our Dinosaurs Is Missing
- One Sunday Afternoon (1933)
- One Too Many Mornings
- One Two Three
- Only When I Laugh
- Only You
- Only You (1994)
- Open Season 3
- Operation "Y", or Shurik's Other Adventures
- Operation Dumbo Drop