| Orenstein, Sarah, | Sarah Orenstein | Actor | 2004 | 1 | |
| Organ, Alex | Alex Organ | Actor, Sound Designer | 2002 | 2 | |
| Orlik, Stanisław | Stanisław Orlik | Actor | 1904 - 1913 | 4 | |
| Orliński, Janusz, | Janusz Orliński | Actor | 1904 - 1917 | 9 | |
| Orloff, Penny | Penny Orloff | Actor | 1982 | 1 | |
| Orlovsky, Claudia | Claudia Orlovsky | Choreographer | 1998 | 1 | |
| Orme, Michael | Michael Orme | Director, Producer | 1930 - 1931 | 5 | |
| Ormond, Claire | Claire Ormond | Actor | 1993 | 1 | |
| Orr, Diane | Diane Orr | Actor | 1979 | 1 | |
| Orsky, Gudrun | Gudrun Orsky | Director | 2004 | 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 | 4 | |
| Oslo, in | in Oslo | | | | |
| Osswald, Leni | Leni Osswald | Costume Designer | 1955 | 2 | |
| Ostermayer, Christine | Christine Ostermayer | Actor | 1965 | 2 | |
| Oswald, Axsel | Axsel Oswald | Actor | 1936 - 1937 | 2 | |
| Ott, Günther, | Günther Ott | Actor | 1931 | 1 | |
| Ott, Sharon | Sharon Ott | Director | 1993 - 1998 | 3 | |
| Ottavino, John | John Ottavino | Actor | 1997 | 1 | |
| Ottbert, Otto, | Otto Ottbert | Actor, Director | 1876 - 1890 | 7 | |
| Ottesen, Helle, | Helle Ottesen | Actor | 1975 - 2013 | 7 | |
| Otto, Alexander, | Alexander Otto | Actor, Designer | 1919 | 7 | |
| Otto, Harald, | Harald Otto | Actor, Director | 1896 - 1921 | 55 | |
| Otto, Miranda | Miranda Otto | Actor | 2002 | 1 | |
| Otto, Pavel | Pavel Otto | Actor | 1957 | 1 | |
| Otto, Wilfried, | Wilfried Otto | Designer | 1958 | 1 | |
| Ourth, Georges | Georges Ourth | Actor, Director | 1978 | 2 | |
| Outin, Régis | Régis Outin | Actor | 1928 | 2 | |
| Ouyoung, Juliet | Juliet Ouyoung | Costume Designer | 1993 | 1 | |
| ova, Kry | Kry ova | | | | |
| ov!, Luk! | Luk! ov! | | | | |
| Overbey, Kellie, | Kellie Overbey | Actor | 1998 | 1 | |
| Owen, Hugh | Hugh Owen | Designer | 1927 | 1 | |
| Owen, John | John Owen | Sound Designer | 1996 - 1997 | 3 | |
| Owen, Marianne | Marianne Owen | Actor | 1978 - 1997 | 4 | |
| Owings, Sarah, | Sarah Owings | Actor | 1976 | 1 | |
| O'Brien, Eileen | Eileen O'Brien | Actor | 2000 | 8 | |
| Ovtsjinnikova, Olga | Olga Ovtsjinnikova | | | | |
| Ostermeier, Thomas, | Thomas Ostermeier | Adaptation, Director, Translator | 2002 - 2019 | 178 | |
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