| Name | Functions | Event Dates  | Events | Resources | ||
|---|---|---|---|---|---|---|
| Arve Opsahl | Actor | 1958 | 1 | |||
| Hermann Obermeier | Actor | 1958 | 1 | |||
| James O'Brien | Actor | 1957 - 1971 | 2 | |||
| Pavel Otto | Actor | 1957 | 1 | |||
| Jaye O'Brien | Actor | 1957 | 1 | |||
| Krystyna Ostaszewska | Actor | 1957 | 1 | |||
| Karin Olafsdottir | Actor | 1957 | 1 | |||
| Jöran Olsson | Actor | 1957 | 1 | |||
| Fredrik Ohlsson | Actor | 1957 | 3 | |||
| Ragnar Olason | Actor | 1956 - 1973 | 48 | |||
| Nora Oosterwijk | Actor | 1956 - 1957 | 3 | |||
| Gustaf Hiort af Ornäs | Actor | 1956 | 1 | |||
| Mircea Olarin (Olaru?) | Actor | 1956 | 1 | |||
| Daniel Obradovic | Actor | 1956 | 1 | |||
| Ilde Overhoff | Actor | 1956 | 1 | |||
| Sulo Ovaska | Actor, Designer | 1956 | 2 | |||
| Wazlaw Orlikowsky | Adaptation, Choreographer, Director | 1956 | 3 | |||
| Necmi Oy | Actor | 1956 | 2 | |||
| Svein Eirik Opsahl | Actor | 1956 | 2 | |||
| Audrey O'Hara | Actor | 1956 | 1 | |||
| Carolyn O'Donnell | Dancer | 1956 | 1 | |||
| Ladislav Obuch | Translator | 1955 - 2021 | 14 | |||
| Helmut Oeser | Actor | 1955 - 2003 | 6 | |||
| Aleksandar Ognjanović | Director | 1955 - 1979 | 4 | |||
| Kirsti Ortola | Actor | 1955 - 1971 | 4 | |||
| Edith Ottosen | Actor | 1955 - 1967 | 4 | |||
| Arne Thomas Olsen | Actor, Director | 1955 - 1963 | 19 | |||
| Leni Osswald | Costume Designer | 1955 - 1962 | 2 | |||
| Yasushi Ohki | Director | 1955 - 1956 | 2 | |||
| Elmar Osborn | Actor | 1955 | 1 | |||
| Edgar Olt | Actor | 1955 | 3 | |||
| Oscar Ottesen | Lighting Designer | 1954 - 1971 | 4 | |||
| Jens-Anker Olsen | Designer | 1954 - 1956 | 2 | |||
| Åke Ohberg | Actor | 1954 | 1 | |||
| Betty O'Nians | Actor | 1954 | 1 | |||
| Gérard Oury | Actor | 1954 | 1 | |||
| Michel Odekerken | Actor | 1954 | 1 | |||
| Erna Ophaug | Sound Designer | 1953 - 2006 | 4 | |||
| Heinz Ockermüller | Designer | 1953 | 1 | |||
| Shiro Okakura | Director | 1953 | 1 | |||
| Yoshio Ohmori | Actor | 1953 | 1 | |||
| Fumio Ohmachi | Actor | 1953 | 1 | |||