| Olsen, Moroni | Moroni Olsen | Actor | 1927 | 1 | |
| Olland, Bill | Bill Olland | Actor | 1976 | 1 | |
| Oesterhelt, Ingrid | Ingrid Oesterhelt | Actor | 1973 | 1 | |
| Oelmann, Klaus | Klaus Oelmann | Actor | 1973 | 1 | |
| Orson, Barbara | Barbara Orson | Actor | 1968 - 1998 | 7 | |
| Orgill, Paul | Paul Orgill | Actor | 1973 | 1 | |
| Obermüller, Hans | Hans Obermüller | Actor | 1971 - 1981 | 6 | |
| Olsen, L. Katherine | L. Katherine Olsen | Actor | 1928 | 1 | |
| Oen, Einar | Einar Oen | Actor | 1928 | 1 | |
| Oram, Frederic-Winslow | Frederic-Winslow Oram | Actor | 1974 | 1 | |
| Orson, Diane | Diane Orson | Musician | 1975 | 1 | |
| Oberschlick, Gerhard | Gerhard Oberschlick | Dramaturg | 1975 | 1 | |
| Olsen, Ingunn | Ingunn Olsen | Actor | 1978 | 1 | |
| Orstad, Kjell | Kjell Orstad | Lighting Designer | 1971 | 1 | |
| Ouedraogo, Gérard | Gérard Ouedraogo | Actor | 2002 | 2 | |
| Ouedraogo, Issa | Issa Ouedraogo | Actor | 2002 | 2 | |
| Ouedraogo, Léontine | Léontine Ouedraogo | Actor | 2002 | 2 | |
| Olsson, Thomas | Thomas Olsson | Actor | 1998 - 2017 | 3 | |
| Owen, Paul | Paul Owen | Costume Designer | 1972 | 1 | |
| Ottesen, Oscar | Oscar Ottesen | Lighting Designer | 1954 - 1971 | 4 | |
| Olsen, Arne, H. | Arne H. Olsen | Lighting Designer | 1971 - 1978 | 5 | |
| Ouedraogo, Marceline | Marceline Ouedraogo | Actor | 1992 | 1 | |
| Olszewski, Zbigniew | Zbigniew Olszewski | Actor | 1992 | 2 | |
| Ostałowska, Dominika | Dominika Ostałowska | Actor | 2005 - 2006 | 4 | |
| Orvelius, Gunilla | Gunilla Orvelius | Actor | 1992 - 2002 | 27 | |
| Oredsson, Thomas | Thomas Oredsson | Actor | 1975 - 1997 | 27 | |
| Onaityte, Jurate | Jurate Onaityte | Actor | 1998 - 2000 | 4 | |
| Onetto, Elvira | Elvira Onetto | Actor | 2009 - 2011 | 13 | |
| O'Lochlainn, Gearoid | Gearoid O'Lochlainn | Actor, Translator | 1928 - 2009 | 2 | |
| Obreschkov, - | - Obreschkov | Actor | 1928 | 1 | |
| Orsborn, Lura | Lura Orsborn | Actor | 1928 | 1 | |
| Ortiz, Esperanza | Esperanza Ortiz | Actor | 1928 - 1929 | 9 | |
| Ortiz, Natalia | Natalia Ortiz | Actor | 1929 | 1 | |
| Országhová, Olga B. | Olga B. Országhová | Actor | 1929 | 1 | |
| Ogilvie, Michael | Michael Ogilvie | Actor | 1978 - 1982 | 4 | |
| Omodei, Raymond | Raymond Omodei | Designer, Director | 1974 - 2001 | 5 | |
| Orczyńska, Mieczysława | Mieczysława Orczyńska | Actor | 1911 | 1 | |
| Ooms, Johan | Johan Ooms | Actor | 1975 - 1981 | 3 | |
| Olsson, Åsa | Åsa Olsson (Olsson, Aasa) | Actor | 1970 | 1 | |
| Olsen, Lauritz | Lauritz Olsen | Actor | 1911 | 1 | |
| Orck, Charles | Charles Orck | Actor | 1970 | 1 | |
| O'Callaghan, Maurice | Maurice O'Callaghan | Actor | 1972 | 1 | |
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