| Olsen, Clifford, R. | Clifford R. Olsen | Actor, Director | 1963 | 2 | |
| Orea, Mario | Mario Orea | Actor | 1961 - 1963 | 2 | |
| O'Connor, Boardman | Boardman O'Connor | Designer, Lighting Designer | 1961 | 2 | |
| O'Brien, Adale | Adale O'Brien | Actor | 1961 - 1962 | 2 | |
| O'Keefe, Tim | Tim O'Keefe | Actor | 2012 | 2 | |
| O'Connell, Dan | Dan O'Connell | Actor, Director | 1943 - 1961 | 2 | |
| O’Shaughnessy, Hilary | Hilary O’Shaughnessy | Actor | 2011 | 2 | |
| O’Connell, Will | Will O’Connell | Actor | 2011 | 2 | |
| Orlenco, Alexej | Alexej Orlenco | Actor | 2011 | 2 | |
| Olćan, Olga | Olga Olćan | Actor | 2011 | 2 | |
| Olsen, Oliver | Oliver Olsen | Costume Designer | 1959 | 2 | |
| Oliver, Norman | Norman Oliver | Actor | 1959 | 2 | |
| Olsen, Jens-Anker | Jens-Anker Olsen | Designer | 1954 - 1956 | 2 | |
| Olinescu, Boris | Boris Olinescu | Actor, Assistant Director | 1959 | 2 | |
| Ovaska, Sulo | Sulo Ovaska | Actor, Designer | 1956 | 2 | |
| Ohki, Yasushi | Yasushi Ohki | Director | 1955 - 1956 | 2 | |
| Olin, Kerstin | Kerstin Olin | Actor | 1953 | 2 | |
| Oy, Necmi | Necmi Oy | Actor | 1956 | 2 | |
| Opsahl, Svein, Eirik | Svein Eirik Opsahl | Actor | 1956 | 2 | |
| Odegard, Mary Sue | Mary Sue Odegard | Actor | 1963 | 2 | |
| Orgulas, Jaanus | Jaanus Orgulas | Actor | 1962 - 1989 | 2 | |
| Ollila, Yrjö | Yrjö Ollila | Costume Designer, Designer | 1930 | 2 | |
| Oppenheimer, Albert, M. | Albert M. Oppenheimer | Actor | 1931 | 2 | |
| Ostrižnaja, O. | O. Ostrižnaja | Lighting Designer | 1999 - 2000 | 2 | |
| Oikonomidis, Kostas | Kostas Oikonomidis | Actor | 1934 | 2 | |
| O'Flyn, Audrey | Audrey O'Flyn | Actor | 1936 | 2 | |
| Oldenhof, Bouke | Bouke Oldenhof | Adaptation, Translator | 1999 | 2 | |
| Opgaard, John | John Opgaard | Actor, Designer | 1939 | 2 | |
| Orth, Philip | Philip Orth | Actor | 1940 | 2 | |
| O'Connell, Alice | Alice O'Connell | Actor | 1940 | 2 | |
| Orfanos, Lampros | Lampros Orfanos | Costume Designer, Designer | 1943 | 2 | |
| Orell, Heinrich | Heinrich Orell | Actor, Director | 1911 | 2 | |
| O'Connell, Richard | Richard O'Connell | Director | 1947 | 2 | |
| Ohoka, Kinji | Kinji Ohoka | Director, Translator | 1971 | 2 | |
| Orbán , Levente | Levente Orbán | Actor | 2016 | 2 | |
| Ognyanova, Rositsa | Rositsa Ognyanova | Actor | 2015 - 2016 | 2 | |
| Orhon, Coşkun | Coşkun Orhon (Coskun Orhon) | Actor | 1965 - 1971 | 2 | |
| Olivero, Franco | Franco Olivero | Actor | 1986 | 2 | |
| Ottesen, Thorbjørn | Thorbjørn Ottesen | Musician | 1993 - 1994 | 2 | |
| Oppel, Heinrich | Heinrich Oppel | Actor | 1889 | 2 | |
| Otto, Karl | Karl Otto | Actor | 1910 - 1911 | 2 | |
| Ogden, Betty | Betty Ogden | Actor | 1969 - 1972 | 2 | |
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