| Olsen, Arne, H. | Arne H. Olsen | Lighting Designer | 1971 - 1978 | 5 | |
| 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 | |
| Oftebro, Nils Ole | Nils Ole Oftebro | Actor | 1970 - 2018 | 92 | 1 |
| Ożana, Edward | Edward Ożana | Actor | 1970 - 1975 | 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 |
| Ogăşanu, Virgil | Virgil Ogăşanu | Actor | 1969 - 2006 | 6 | 1 |
| Oubram, Stanislav | Stanislav Oubram | Actor | 1969 - 2006 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
| Ogden, Betty | Betty Ogden | Actor | 1969 - 1972 | 2 | |
| Oudart, Gisèle | Gisèle Oudart | Actor | 1969 | 1 | 1 |
| Ombuen, Gianfranco | Gianfranco Ombuen | Actor | 1969 | 2 | |
| Olijnyk, Jiří | Jiří Olijnyk | Actor | 1969 | 1 | |
| O'Sullivan, Mathew | Mathew O'Sullivan | Actor | 1969 | 1 | |
| Opočenský, Gustav | Gustav Opočenský | Actor | 1969 | 1 | |
| Ongley, Warwick | Warwick Ongley | Director | 1969 | 1 | |
| Ottoson, Rune | Rune Ottoson | Actor | 1969 | 1 | |
| O'Connor, Paul | Paul O'Connor | Actor | 1969 | 1 | |
| Otegui, Juan José | Juan José Otegui | Actor | 1969 | 1 | |
| Ogata, Kikuko | Kikuko Ogata | Costume Designer | 1968 - 2010 | 2 | |
| Orson, Barbara | Barbara Orson | Actor | 1968 - 1998 | 7 | |
| Oze, Toshiko | Toshiko Oze | Actor | 1968 | 1 | |
| Ostroróg, Mieczysław | Mieczysław Ostroróg | Actor | 1968 | 2 | |
| Owen, Jan | Jan Owen | Actor | 1968 | 1 | |
| Olschewski, Otto-Richard | Otto-Richard Olschewski | Actor | 1968 | 1 | |
| Oettinger, Karen | Karen Oettinger | Actor | 1968 | 2 | |
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