| Ovanessian, Arby | Arby Ovanessian | Costume Designer, Designer, Director | 1970 | 3 | |
| Ogăşanu, Virgil | Virgil Ogăşanu | Actor | 1969 - 2006 | 6 | |
| 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 | |
| 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 | |
| Ornstein, Brigitte | Brigitte Ornstein | Actor | 1968 | 1 | |
| Oyamada, Munenori | Munenori Oyamada | Actor | 1968 | 1 | |
| Osanai, Minako | Minako Osanai | Actor | 1968 | 1 | |
| Oravisto, Matti | Matti Oravisto | Actor | 1968 | 1 | |
| Ovanez Doroşenco, Anca | Anca Ovanez Doroşenco | Director | 1968 | 1 | |
| O'Wisiedo, Mayrata | Mayrata O'Wisiedo | Actor | 1968 | 1 | |
| Orjas, José | José Orjas | Actor | 1968 | 1 | |
| Ostr, Alois | Alois Ostr | Actor | 1967 | 1 | |
| Ogawa, Hisao | Hisao Ogawa | Lighting Designer | 1967 | 1 | |
| Owens, Charlotte | Charlotte Owens | Actor | 1967 | 1 | |
| Okazaki, Tomomi | Tomomi Okazaki | Actor | 1967 | 1 | |
| Otto, Anneliese | Anneliese Otto | Actor | 1966 | 1 | |
| Ott, Ludwig | Ludwig Ott | Actor | 1966 | 1 | |
| O'Connell, Hans | Hans O'Connell | Actor | 1966 | 1 | |
| Oglesby, Aaron | Aaron Oglesby | Actor | 1966 | 1 | |
| Oeser, Wolfgang | Wolfgang Oeser | Actor | 1966 | 1 | |
| Ott, Isabella | Isabella Ott | Actor | 1966 | 1 | |
| Olson, James | James Olson | Actor | 1966 | 1 | |
| Orlac, Stephan | Stephan Orlac | Actor | 1966 | 2 | |
| Oikonomidou, Miranta | Miranta Oikonomidou | Actor | 1965 - 1994 | 4 | |
| Orhon, Coşkun | Coşkun Orhon | Actor | 1965 - 1971 | 2 | |
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