| Ouedraogo, Léontine | Léontine Ouedraogo | Actor | 2002 | 2 | |
| Olszewski, Zbigniew | Zbigniew Olszewski | Actor | 1992 | 2 | |
| O'Lochlainn, Gearoid | Gearoid O'Lochlainn | Actor, Translator | 1928 - 2009 | 2 | |
| Ohkata, Hisako | Hisako Ohkata | Actor | 1978 - 1983 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
| Ohnesorge, Helli | Helli Ohnesorge | Actor | 1978 - 1986 | 2 | |
| Ohlschewski, Gerhard | Gerhard Ohlschewski | Actor | 1975 | 2 | |
| Ostrowski, Janusz | Janusz Ostrowski | Actor | 1975 | 2 | |
| Owens, Elizabeth | Elizabeth Owens | Actor | 1971 - 1979 | 2 | |
| Otto, Carsten | Carsten Otto | Actor | 1975 - 1976 | 2 | |
| Oberhof, Johannes | Johannes Oberhof | Actor | 1972 | 2 | |
| Ozolins, Miervaldis | Miervaldis Ozolins | Actor | 1964 - 1975 | 2 | |
| Otsus, Velda | Velda Otsus | Actor | 1962 - 1976 | 2 | |
| Ozolkāja, Kārlis | Kārlis Ozolkāja | Actor | 1914 - 1915 | 2 | |
| Outler, Walter | Walter Outler | Actor | 1928 | 2 | |
| Oftedahl, Ole | Ole Oftedahl | Actor, Dancer | 1928 | 2 | |
| Obermaierová, Jaroslava | Jaroslava Obermaierová | Actor | 1972 - 2006 | 2 | |
| Oberwalder, Lisl | Lisl Oberwalder | Actor | 1958 - 1962 | 2 | |
| Otto, Sabine | Sabine Otto | Actor | 1975 | 2 | |
| Oliver, Heather | Heather Oliver | Producer | 2005 | 2 | |
| Oikonomidis, Dimitris | Dimitris Oikonomidis | Actor | 2009 | 2 | |
| Olsen, Edgar Meyer | Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |
| Olroth-Hackenbroch, Gisela | Gisela Olroth-Hackenbroch | Designer, Director | 2011 | 2 | |
| Ondráčková, Danuše | Danuše Ondráčková | Actor | 1984 | 2 | |
| Omnéus, Göran | Göran Omnéus | Actor | 1976 | 2 | |
| Oechslin, Rosmarie | Rosmarie Oechslin | Actor | 1985 | 2 | |
| O´Driscoll, Ann | Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |
| Oskam, Peter | Peter Oskam | Costume Designer, Designer | 1985 | 2 | |
| O'Hara, John, Ryker | John Ryker O'Hara | Actor | 1985 | 2 | |
| O'Toole, John | John O'Toole | Actor | 1987 - 2000 | 2 | |
| Olsen, Max | Max Olsen | Actor, Composer | 1987 | 2 | |
| O´Donnell, Sarah | Sarah O´Donnell | Actor | 1987 | 2 | |
| Oliveri, Josephyne | Josephyne Oliveri | Actor | 1987 | 2 | |
| Ornbo, Robert | Robert Ornbo | Lighting Designer | 1978 - 1987 | 2 | 1 |
| O'Brien, Jack | Jack O'Brien | Director | 1990 - 2025 | 2 | 1 |
| Otto, Eva | Eva Otto | Actor | 1991 | 2 | |
| Obermüller, Ulrike | Ulrike Obermüller | Costume Designer | 1991 - 2016 | 2 | |
| Ohlsson, Lotta | Lotta Ohlsson | Actor | 1990 | 2 | |
| Oscarsson, Kjell | Kjell Oscarsson | Actor | 1990 | 2 | |
| Opfinger, Heinz | Heinz Opfinger | Actor | 1990 - 1991 | 2 | |
| Otto, Victoria | Victoria Otto | Actor | 1990 | 2 | |
| Ornest, Jiří | Jiří Ornest | Actor | 1988 - 2012 | 2 | |
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