| O'Brien, Timothy | Timothy O'Brien | Costume Designer, Designer | 1964 - 1996 | 12 | |
| Ogawa, Toshiro | Toshiro Ogawa | Lighting Designer | 1964 - 1981 | 2 | |
| Ozolins, Miervaldis | Miervaldis Ozolins | Actor | 1964 - 1975 | 2 | |
| Oikonomidou, S. | S. Oikonomidou | Actor | 1964 | 1 | |
| Orth, Walther | Walther Orth | Actor | 1964 | 1 | |
| Odqvist, Svante | Svante Odqvist | Actor | 1964 | 1 | |
| O'Sullivan, Pat | Pat O'Sullivan | Lighting Designer | 1964 | 1 | |
| Overton, Marcus | Marcus Overton | Actor | 1964 | 1 | |
| Olsson, Erik | Erik Olsson | Actor | 1964 | 1 | |
| Ochoa, Diana | Diana Ochoa | Actor | 1964 | 1 | |
| Orlowicz, Tadeusz | Tadeusz Orlowicz | Designer | 1964 | 1 | |
| Orsini, Umberto | Umberto Orsini | Actor | 1963 - 2020 | 39 | |
| Ohland, Hans | Hans Ohland | Costume Designer, Designer | 1963 - 1981 | 4 | |
| O'Malley, Flynn | Flynn O'Malley | Actor | 1963 | 1 | |
| O'Connor, Terrence | Terrence O'Connor | Actor | 1963 | 1 | |
| O'Connell, Carol | Carol O'Connell | Actor | 1963 | 1 | |
| Ortolani, Attilio | Attilio Ortolani | Actor | 1963 | 1 | |
| Orlinsky, Walter | Walter Orlinsky | Actor | 1963 | 1 | |
| Overmyer, Richard | Richard Overmyer | Actor | 1963 | 1 | |
| Olsen, Richard, K. | Richard K. Olsen | Actor | 1963 | 1 | |
| Olsen, Clifford, R. | Clifford R. Olsen | Actor, Director | 1963 | 2 | 1 |
| Odegard, Mary Sue | Mary Sue Odegard | Actor | 1963 | 2 | |
| Offermann, Mary | Mary Offermann | Actor | 1963 | 1 | |
| Oettinger, Joan | Joan Oettinger | Actor | 1963 | 1 | |
| Odegard, Thomas | Thomas Odegard | Actor | 1963 | 1 | |
| O'Donnell, Penny | Penny O'Donnell | Actor | 1963 | 1 | |
| Orav, Aksel | Aksel Orav | Actor | 1962 - 1997 | 5 | |
| Orgulas, Jaanus | Jaanus Orgulas | Actor | 1962 - 1989 | 2 | |
| Otsus, Velda | Velda Otsus | Actor | 1962 - 1976 | 2 | |
| Osa, Sigbjørn, Bernhoft | Sigbjørn Bernhoft Osa | Actor | 1962 - 1965 | 4 | |
| Onsum, Per | Per Onsum | Actor | 1962 - 1965 | 4 | |
| Oldenbürger, Hans | Hans Oldenbürger | Actor | 1962 | 1 | |
| Ortmanns, Wolfram | Wolfram Ortmanns | Actor | 1962 | 1 | |
| Orthous, Pedro | Pedro Orthous | Director | 1962 | 1 | |
| Ocaranza, Ruben | Ruben Ocaranza | Actor | 1962 | 1 | |
| Ockel, Sigrid | Sigrid Ockel | Actor | 1962 | 1 | |
| Orea, Mario | Mario Orea | Actor | 1961 - 1963 | 2 | |
| Oberlin, Richard | Richard Oberlin | Actor | 1961 - 1963 | 4 | |
| O'Brien, Adale | Adale O'Brien | Actor | 1961 - 1962 | 2 | |
| Oligmüller, Kurt | Kurt Oligmüller | Actor | 1961 | 1 | |
| Orlemann, Philipp | Philipp Orlemann | Actor | 1961 | 1 | |
| O'Neill, Desmond | Desmond O'Neill | Actor | 1961 | 1 | |
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