| O'Kane, Nancy | Nancy O'Kane | Actor | 1952 - 1961 | 2 | |
| Oechslin, Ary | Ary Oechslin | Costume Designer, Designer | 1952 - 1978 | 11 | 1 |
| Ockermüller, Heinz | Heinz Ockermüller | Designer | 1953 | 1 | |
| Okakura, Shiro | Shiro Okakura | Director | 1953 | 1 | |
| Ohmori, Yoshio | Yoshio Ohmori | Actor | 1953 | 1 | |
| Ohmachi, Fumio | Fumio Ohmachi | Actor | 1953 | 1 | |
| Olsen, Thomas, Arne | Thomas Arne Olsen | Actor | 1953 | 1 | |
| Olin, Kerstin | Kerstin Olin | Actor | 1953 | 2 | |
| Ophaug, Erna | Erna Ophaug | Sound Designer | 1953 - 2006 | 4 | |
| Ohberg, Åke | Åke Ohberg | Actor | 1954 | 1 | |
| O'Nians, Betty | Betty O'Nians | Actor | 1954 | 1 | |
| Oury, Gérard | Gérard Oury | Actor | 1954 | 1 | |
| Odekerken, Michel | Michel Odekerken | Actor | 1954 | 1 | |
| Olsen, Jens-Anker | Jens-Anker Olsen | Designer | 1954 - 1956 | 2 | |
| Ottesen, Oscar | Oscar Ottesen | Lighting Designer | 1954 - 1971 | 4 | |
| Osborn, Elmar | Elmar Osborn | Actor | 1955 | 1 | |
| Olt, Edgar | Edgar Olt | Actor | 1955 | 3 | |
| Ohki, Yasushi | Yasushi Ohki | Director | 1955 - 1956 | 2 | |
| Osswald, Leni | Leni Osswald | Costume Designer | 1955 - 1962 | 2 | |
| Olsen, Arne, Thomas | Arne Thomas Olsen | Actor, Director | 1955 - 1963 | 19 | 1 |
| Ottosen, Edith | Edith Ottosen | Actor | 1955 - 1967 | 4 | |
| Ortola, Kirsti | Kirsti Ortola | Actor | 1955 - 1971 | 4 | |
| Ognjanović, Aleksandar | Aleksandar Ognjanović | Director | 1955 - 1979 | 4 | |
| Oeser, Helmut | Helmut Oeser | Actor | 1955 - 2003 | 6 | |
| Obuch, Ladislav | Ladislav Obuch | Translator | 1955 - 2021 | 14 | 1 |
| Ornäs, Gustaf Hiort, af | Gustaf Hiort af Ornäs | Actor | 1956 | 1 | |
| Olarin (Olaru?), Mircea | Mircea Olarin (Olaru?) | Actor | 1956 | 1 | |
| Obradovic, Daniel | Daniel Obradovic | Actor | 1956 | 1 | |
| Overhoff, Ilde | Ilde Overhoff | Actor | 1956 | 1 | |
| Ovaska, Sulo | Sulo Ovaska | Actor, Designer | 1956 | 2 | |
| Oy, Necmi | Necmi Oy | Actor | 1956 | 2 | |
| Opsahl, Svein, Eirik | Svein Eirik Opsahl | Actor | 1956 | 2 | |
| O'Hara, Audrey | Audrey O'Hara | Actor | 1956 | 1 | |
| O'Donnell, Carolyn | Carolyn O'Donnell | Dancer | 1956 | 1 | |
| Oosterwijk, Nora | Nora Oosterwijk | Actor | 1956 - 1957 | 3 | |
| Orlikowsky, Wazlaw | Wazlaw Orlikowsky | Adaptation, Choreographer, Director | 1956 - 1964 | 4 | 1 |
| Olason, Ragnar | Ragnar Olason | Actor | 1956 - 1973 | 48 | |
| Otto, Pavel | Pavel Otto | Actor | 1957 | 1 | |
| O'Brien, Jaye | Jaye O'Brien | Actor | 1957 | 1 | |
| Ostaszewska, Krystyna | Krystyna Ostaszewska | Actor | 1957 | 1 | |
| Olafsdottir, Karin | Karin Olafsdottir | Actor | 1957 | 1 | |
| Olsson, Jöran | Jöran Olsson | Actor | 1957 | 1 | |
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