Actors − Letter O
- O. Z. Whitehead (1 movie)
- Ola Sturik (1 movie)
- Olga Lindo (1 movie)
- Olga Wehrly (2 movies)
- Olive White (1 movie)
- Oliver Mason (1 movie)
- Oliver Phelps (1 movie)
- Oliver Reed (2 movies)
- Olivia Colman (1 movie)
- Olivia Williams (2 movies)
- Olivier Gourmet (1 movie)
- Olwen Catherine Kelly (1 movie)
- Olwen Fouéré (1 movie)
- Omar Benson Miller (1 movie)
- Omar Bonaro (1 movie)
- Oona Chaplin (1 movie)
- Orla Brady (2 movies)
- Orla Fitzgerald (1 movie)
- Orla Long (1 movie)
- Orla O'Rourke (2 movies)
- Orla Tobin (1 movie)
- Orlaith Macqueen (1 movie)
- Orlando Seale (1 movie)
- Orson Welles (2 movies)
- Oscar Isaac (1 movie)
- Oskar Ricketts (1 movie)
- Oskar Werner (1 movie)
- Otto Gebühr (1 movie)
- Otto Heinzle (1 movie)
- Otto Schmöle (1 movie)
- Owen McDonnell (2 movies)
- Owen Roe (5 movies)
- Owen Sharpe (1 movie)
- Owen Sullivan (1 movie)
- Owen Wilson (1 movie)