| 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 | |
| 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 | |
| Oredsson, Thomas | Thomas Oredsson | Actor | 1975 - 1997 | 27 | |
| Onaityte, Jurate | Jurate Onaityte | Actor | 1998 - 2000 | 4 | |
| 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 | |
| Ohkata, Hisako | Hisako Ohkata | Actor | 1978 - 1983 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
| Osborne, Nina | Nina Osborne | Actor | 1912 | 1 | |
| O'Neill, Norman | Norman O'Neill | Composer | 1913 | 1 | |
| Orchardson, Yvonne Q. | Yvonne Q. Orchardson | Actor | 1913 | 1 | |
| Oudinotis, Alekos | Alekos Oudinotis | Actor | 1975 - 1985 | 5 | |
| O'Connor, Cecile | Cecile O'Connor | Actor | 1973 | 7 | |
| Ohnesorge, Helli | Helli Ohnesorge | Actor | 1978 - 1986 | 2 | |
| Ostrowsky, Hartmut | Hartmut Ostrowsky | Director | 1975 | 1 | |
| Orr, Terence | Terence Orr | Sound Designer | 1975 | 1 | |
| Otto, Julius | Julius Otto | Actor | 1880 - 1898 | 6 | |
| Owen, Brett | Brett Owen | Actor | 1979 | 1 | |
| Ognjanović, Aleksandar | Aleksandar Ognjanović | Director | 1955 - 1979 | 4 | |
| Oikonomidou, Rania | Rania Oikonomidou | Actor | 1976 - 2004 | 7 | |
| Ohlschewski, Gerhard | Gerhard Ohlschewski | Actor | 1975 | 2 | |
| Olschok, Herbert | Herbert Olschok | Director | 1988 - 2014 | 5 | |
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