- Ou-Yang Sha-Fei (20 movies)
- Oho Ou (6 movies)
- O Sing-Pui (4 movies)
- Oi-Kit Fan (3 movies)
- Oscar Leung (3 movies)
- Osman Hung (3 movies)
- Ou-Yang Ching (3 movies)
- Olivia Cheng (2 movies)
- Oscar Sun (2 movies)
- Oceane Zhu (1 movie)
- Oda Kaoru (1 movie)
- Ogawa Takeru (1 movie)
- Oggy Ho Hong-Man (1 movie)
- Ogie Banks (1 movie)
- Oh Dal-su (1 movie)
- Oh Gwang-rok (1 movie)
- Ólafur Darri Ólafsson (1 movie)
- Olga Magnytskaya (1 movie)
- Olga Miller (1 movie)
- Oliver May (1 movie)
- Oliver Platt (1 movie)
- Oliver Ryan (1 movie)
- Oliver Tan (1 movie)
- Oliver Yan (1 movie)
- Olivia Hussey (1 movie)
- Olivia Poulet (1 movie)
- Olivia Yan (1 movie)
- Oma (1 movie)
- On Wai-Lin (1 movie)
- Ong Chao Hong (1 movie)
- Oni Tsuka (1 movie)
- Onno Boelee (1 movie)
- Oona Mekas (1 movie)
- Oris Erhuero (1 movie)
- Orso Maria Guerrini (1 movie)
- Oscar Agramonte (1 movie)
- Oscar Leung Lit-Wai (1 movie)
- Osric Chau (1 movie)
- Ottaviano Dell'Acqua (1 movie)
- Otto Chan Chi-Kin (1 movie)
- Otto Sander (1 movie)
- Otto Wong (1 movie)
- Ou Di (1 movie)
- Ousaun Elam (1 movie)
- Ousinthorn Chotphan (1 movie)
- Ouyang Nana (1 movie)
- Owodog Chuang (1 movie)
- Oyunsang (1 movie)
- Ozer Ercan (1 movie)