- O-Lan Jones (1 movie)
- O'Shea Jackson Jr. (2 movies)
- Oakes Fegley (1 movie)
- Oakley Bull (1 movie)
- Obie Matthew (1 movie)
- Ocean James (1 movie)
- Octavia Selena Alexandru (1 movie)
- Octavia Spencer (6 movies)
- Octavius J. Johnson (1 movie)
- Odeta Cali (1 movie)
- Okieriete Onaodowan (1 movie)
- Ola Rapace (1 movie)
- Olek Krupa (1 movie)
- Olga Dihovichnaya (1 movie)
- Oliver Bigalke (1 movie)
- Oliver Chris (1 movie)
- Oliver Cooper (1 movie)
- Oliver Cotton (1 movie)
- Oliver Jackson-Cohen (1 movie)
- Oliver McGrath (1 movie)
- Oliver Platt (4 movies)
- Oliver Sindcup (1 movie)
- Oliver Stark (1 movie)
- Oliver Steer (1 movie)
- Olivia Bond (1 movie)
- Olivia Cooke (1 movie)
- Olivia Gillies (1 movie)
- Olivia H. Hunt (1 movie)
- Olivia Hamilton (1 movie)
- Olivia Kate Rice (1 movie)
- Olivia Munn (2 movies)
- Olivia Perez (1 movie)
- Olivia Ross (1 movie)
- Olivia Wilde (1 movie)
- Olivier Gourmet (1 movie)
- Olly Murs (1 movie)
- Omar Chaparro (2 movies)
- Omar Epps (1 movie)
- Omar J. Dorsey (1 movie)
- Omar Maskati (1 movie)
- Omar Metwally (1 movie)
- Omar Sy (2 movies)
- Omari Bernard (1 movie)
- Onalee Ames (1 movie)
- Onika Day (1 movie)
- Oona Laurence (4 movies)
- Ori Pfeffer (2 movies)
- Oriana Sabatini (1 movie)
- Orla O'Rourke (1 movie)
- Orlando Bloom (2 movies)