- O.B. Clarence (2 movies)
- Odette Myrtil (1 movie)
- Odile Versois (1 movie)
- Olaf Hytten (3 movies)
- Olaf Storm (1 movie)
- Ole Jansen (1 movie)
- Olin Francis (1 movie)
- Olin Howland (3 movies)
- Olive Blakeney (1 movie)
- Olive Cox (1 movie)
- Oliver Hardy (1 movie)
- Olivia de Havilland (1 movie)
- Olly Boeheim (1 movie)
- Ona Munson (1 movie)
- Onslow Stevens (1 movie)
- Orson Welles (1 movie)
- Oscar Apfel (1 movie)
- Oscar Asche (1 movie)
- Oscar Gahan (1 movie)
- Oscar Levant (1 movie)
- Oscar O'Shea (1 movie)
- Oscar Stribolt (1 movie)
- Oskar Homolka (1 movie)
- Otis Harlan (1 movie)
- Otto Hoffman (1 movie)
- Otto Lederer (1 movie)
- Otto Matieson (2 movies)
- Ottola Nesmith (1 movie)
- Owen Moore (1 movie)