- O'Clair Alexander (1 movie)
- O'Neal Compton (1 movie)
- O'Shea Jackson Jr. (1 movie)
- O-Lan Jones (3 movies)
- O.J. Simpson (2 movies)
- O.T. Fagbenle (1 movie)
- Oakes Fegley (1 movie)
- Oakley Bull (1 movie)
- Oakley Lehman (2 movies)
- Obada Alassadi (1 movie)
- Obba Babatundé (2 movies)
- Obi Abili (1 movie)
- Obie Matthew (1 movie)
- Obssa Ahmed (1 movie)
- Ocean Hellman (1 movie)
- Ocean James (1 movie)
- Ochuwa Oghie (1 movie)
- Octavia Chavez-Richmond (1 movie)
- Octavia Spencer (6 movies)
- Octavian Cadia (1 movie)
- Oded Fehr (1 movie)
- Odera Adimorah (1 movie)
- Odessa Feaster (1 movie)
- Odessa Sykes (1 movie)
- Odessa Young (2 movies)
- Odeta Cali (1 movie)
- Odette Annable (4 movies)
- Odette Michell (1 movie)
- Ofelia Medina (1 movie)
- Ofu Obekpa (1 movie)
- Oh Hye-won (1 movie)
- Oisín Nolan (1 movie)
- Oksana Akinshina (1 movie)
- Oksana Zilinskas (1 movie)
- Ola B. Johannessen (1 movie)
- Ola Døhl (1 movie)
- Ola G. Furuseth (2 movies)
- Ola Hedén (1 movie)
- Ola Ray (2 movies)
- Ola Sturik (1 movie)
- Olaf Lubaszenko (1 movie)
- Ólafur Darri Ólafsson (2 movies)
- Olaniyan Thurmon (2 movies)
- Ole Martin Aune Nilsen (1 movie)
- Ole Victor Corral (1 movie)
- Oleg Drach (1 movie)
- Oleg Kim (1 movie)
- Oleg Sosnovikov (1 movie)
- Oleg Taktarov (3 movies)
- Olegar Fedoro (1 movie)