| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
| Ogăşanu, Virgil | Virgil Ogăşanu | Actor | 1969 - 2006 | 6 | 1 |
| Oubram, Stanislav | Stanislav Oubram | Actor | 1969 - 2006 | 2 | |
| Olsson, Åsa | Åsa Olsson (Olsson, Aasa) | Actor | 1970 | 1 | |
| Orck, Charles | Charles Orck | Actor | 1970 | 1 | |
| Orr, Madeleine | Madeleine Orr | Actor | 1970 | 3 | |
| Ortega, Carmen | Carmen Ortega | Actor | 1970 | 1 | |
| Oftedahl, Peter | Peter Oftedahl | Actor | 1970 | 1 | |
| Olaru, Ion | Ion Olaru | Actor | 1970 | 1 | |
| O'Dwyer, Larry | Larry O'Dwyer | Director | 1970 | 1 | |
| O'Brien, John | John O'Brien | Actor | 1970 | 1 | |
| Ovanessian, Arby | Arby Ovanessian | Costume Designer, Designer, Director | 1970 | 3 | 1 |
| Ożana, Edward | Edward Ożana | Actor | 1970 - 1975 | 2 | |
| Oftebro, Nils Ole | Nils Ole Oftebro | Actor | 1970 - 2018 | 92 | 1 |
| Osterberger, - | - Osterberger | Actor | 1971 | 2 | |
| Olesen, Maggie | Maggie Olesen | Actor | 1971 | 1 | |
| Orstad, Kjell | Kjell Orstad | Lighting Designer | 1971 | 1 | |
| Ousey, Timmy | Timmy Ousey | Actor | 1971 | 1 | |
| O'Connell, Janine | Janine O'Connell | Actor | 1971 | 1 | |
| Ohoka, Kinji | Kinji Ohoka | Director, Translator | 1971 | 2 | |
| Ozker, Eren | Eren Ozker | Actor | 1971 | 1 | |
| O'Hara, Jill | Jill O'Hara | Actor | 1971 | 1 | 1 |
| Otero, Cachi | Cachi Otero | Costume Designer | 1971 | 3 | |
| Ohlin, Bjarne | Bjarne Ohlin | Actor | 1971 | 4 | |
| Olsen, Arne, H. | Arne H. Olsen | Lighting Designer | 1971 - 1978 | 5 | |
| Owens, Elizabeth | Elizabeth Owens | Actor | 1971 - 1979 | 2 | |
| Obermüller, Hans | Hans Obermüller | Actor | 1971 - 1981 | 6 | |
| O'Connell, Deirdre | Deirdre O'Connell | Actor, Director | 1971 - 1985 | 6 | |
| Olsson, Lennart | Lennart Olsson | Director | 1971 - 1987 | 4 | 1 |
| Orth, Elisabeth | Elisabeth Orth | Actor | 1971 - 1995 | 6 | |
| Orsza-Łukasiewicz, Janina | Janina Orsza-Łukasiewicz | Director | 1972 | 1 | |
| Ottesen, Roald | Roald Ottesen | Lighting Designer | 1972 | 1 | |
| Owen, Paul | Paul Owen | Costume Designer | 1972 | 1 | |
| O'Callaghan, Maurice | Maurice O'Callaghan | Actor | 1972 | 1 | |
| Oberhof, Johannes | Johannes Oberhof | Actor | 1972 | 2 | |
| Oman, Timothy | Timothy Oman | Actor | 1972 | 1 | |
| Oliva, Petr | Petr Oliva | Actor | 1972 | 1 | |
| Owen-Jones, Rusty | Rusty Owen-Jones | Actor | 1972 | 1 | |
| Oarcea, Sibylla | Sibylla Oarcea | Actor | 1972 | 4 | |
| O'Hara, Lesley | Lesley O'Hara | Actor | 1972 | 1 | |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | 1 |
| Obermaierová, Jaroslava | Jaroslava Obermaierová | Actor | 1972 - 2006 | 2 | |
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