- Oakes Fegley (1 movie)
- Obie Matthew (1 movie)
- Odelya Halevi (1 movie)
- OIin Reynolds (1 movie)
- Ojasvi Berde (1 movie)
- Olaf Alejandro Velazquez Uribe (1 movie)
- Olga Miller (1 movie)
- Oliver Chapman (1 movie)
- Oliver Vaquer (1 movie)
- Oliver Wheeler (1 movie)
- Olivia Brody (1 movie)
- Olivia Colman (2 movies)
- Olivia Thirlby (1 movie)
- Olivia-Rose Colliard (1 movie)
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- Olli Haaskivi (1 movie)
- Ollie Palmer (1 movie)
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- Onyemachi Ejimofor (1 movie)
- Oraldo Austin (1 movie)
- Orion Hunter (1 movie)
- Os Leanse (1 movie)
- Oscar Camacho (1 movie)
- Oscar Isaac (1 movie)
- Oscar Pavlo (1 movie)
- Oscar Wahlberg (1 movie)
- Osian Roberts (1 movie)
- Osmani Rodriguez (1 movie)
- Owen Teague (1 movie)