O
- Only Fools Fall in Love
- One Second
- One Says No
- One Night Surprise
- One Night Stud
- One Night in Taipei
- One Night in Supermarket
- One Night in Mongkok
- One Mile Above aka Kora
- One Hundred Thousand Bad Jokes
- One Foot Off the Ground
- One Child Nation
- One Armed Against Nine Killers
- One And Eight
- Once Upon a Time in Tibet
- Once Upon a Time in the Northeast
- Once Upon a Time in Shanghai
- Once Upon a Time in Shanghai
- Once Upon a Time in Hong Kong
- Once Upon a Time in China V
- Once Upon a Time in China IV
- Once Upon a Time in China III
- Once Upon a Time in China II
- Once Upon a Time in China and America