- Olivia Colman (2 movies)
- Omkar Das Manikpuri (2 movies)
- Oakes Fegley (1 movie)
- Obie Matthew (1 movie)
- Octavia Grace (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 Thirlby (1 movie)
- Olivia-Rose Colliard (1 movie)
- Olivier Richters (1 movie)
- Olli Haaskivi (1 movie)
- Ollie Palmer (1 movie)
- Olwen Fouéré (1 movie)
- Omar Epps (1 movie)
- Onye Eme-Akwari (1 movie)
- Onyemachi Ejimofor (1 movie)
- Oraldo Austin (1 movie)
- Orion Hunter (1 movie)
- Os Leanse (1 movie)
- Oscar Camacho (1 movie)
- Oscar Gale (1 movie)
- Oscar Isaac (1 movie)
- Oscar Pavlo (1 movie)
- Oscar Wahlberg (1 movie)
- Osian Roberts (1 movie)
- Osmani Rodriguez (1 movie)
- Owen Crow Shoe (1 movie)
- Owen Teague (1 movie)