| Orlik, Stanisław | Stanisław Orlik | Actor | 1904 - 1924 | 4 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1904 - 1916 | 9 | |
| Orloff, Penny | Penny Orloff | Actor | 1982 | 1 | |
| Orlovsky, Claudia | Claudia Orlovsky | Choreographer | 1998 | 1 | |
| Orme, Michael | Michael Orme | Director, Producer | 1930 - 1936 | 5 | |
| Ormond, Claire | Claire Ormond | Actor | 1993 | 1 | |
| Orr, Diane | Diane Orr | Actor | 1979 | 1 | |
| Orth, Elisabeth | Elisabeth Orth | Actor | 1971 - 1995 | 6 | |
| Osborn, Elmar | Elmar Osborn | Actor | 1955 | 1 | |
| Osborne, Dorithy | Dorithy Osborne | Actor | 1943 | 1 | |
| Osborne, Si | Si Osborne | Actor | 2001 | 2 | |
| Oscar, Henry | Henry Oscar | Actor, Director, Producer | 1930 - 1947 | 5 | |
| Osswald, Leni | Leni Osswald | Costume Designer | 1955 - 1962 | 2 | |
| Ostermayer, Christine | Christine Ostermayer | Actor | 1965 - 1969 | 3 | |
| Oswald, Axsel | Axsel Oswald | Actor | 1936 - 1937 | 2 | |
| Ott, Günther | Günther Ott | Actor | 1931 | 1 | |
| Ottavino, John | John Ottavino | Actor | 1997 | 1 | |
| Ottbert, Otto | Otto Ottbert | Actor, Director | 1876 - 1906 | 7 | |
| Otto, Alexander | Alexander Otto | Actor, Designer | 1919 - 1966 | 7 | |
| Otto, Pavel | Pavel Otto | Actor | 1957 | 1 | |
| Otto, Wilfried | Wilfried Otto | Designer | 1958 | 1 | |
| Ourth, Georges | Georges Ourth | Actor, Director | 1978 - 1984 | 2 | |
| Ouyoung, Juliet | Juliet Ouyoung | Costume Designer | 1993 | 1 | |
| ova, Kry | Kry ova | | | | |
| ov!, Luk! | Luk! ov! | | | | |
| Owen, Hugh | Hugh Owen | Designer | 1927 | 1 | |
| Owen, John | John Owen | Sound Designer | 1996 - 1997 | 3 | |
| Owen, Marianne | Marianne Owen | Actor | 1978 - 1996 | 4 | |
| Owings, Sarah | Sarah Owings | Actor | 1976 | 1 | |
| Ovtsjinnikova, Olga | Olga Ovtsjinnikova | | | | |
| Ostermeier, Thomas | Thomas Ostermeier | Adaptation, Director, Translator | 2002 - 2024 | 232 | |
| O'Neil, Raymond | Raymond O'Neil | Actor | 2000 | 1 | |
| O'Malley, Flynn | Flynn O'Malley | Actor | 1963 | 1 | |
| O'Connor, Terrence | Terrence O'Connor | Actor | 1963 | 1 | |
| Obrtelová, Nora | Nora Obrtelová | Dramaturg | 2005 | 1 | |
| Orsza-Łukasiewicz, Janina | Janina Orsza-Łukasiewicz | Director | 1972 | 1 | |
| Otto, Teo | Teo Otto | Costume Designer, Designer, Director | 1934 - 1959 | 14 | |
| Olsen, Kathe B. | Kathe B. Olsen | Actor | 2002 | 1 | |
| Ornäs, Gustaf Hiort, af | Gustaf Hiort af Ornäs | Actor | 1956 | 1 | |
| Osterberger, - | - Osterberger | Actor | 1971 | 2 | |
| Ovčinnikova, O. | O. Ovčinnikova | Actor | 1999 - 2000 | 2 | |
| Olenina, E. | E. Olenina | Dancer | 1999 - 2000 | 2 | |
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