| Ossa, Francisco | Francisco Ossa | Actor | 2018 | 1 | |
| Ospenskaya, Maria | Maria Ospenskaya | Actor | 1932 | 1 | |
| Ospelt, Ingo | Ingo Ospelt | Actor | 1992 | 1 | |
| Osorio, Silvia | Silvia Osorio | Actor | 1981 | 1 | |
| Osokin, Evgeny | Evgeny Osokin (Евгений Осокин) | Actor | 2021 | 1 | |
| Osojnak, Michelle | Michelle Osojnak | Stage Manager | 2025 | 1 | |
| Osmund, Alfred | Alfred Osmund | Actor | 1926 - 1933 | 3 | |
| Osmond, David | David Osmond | Actor | 2012 | 1 | 1 |
| Osmond, Clara | Clara Osmond | Actor | 1906 - 1907 | 3 | |
| Osmelak, Mariusz | Mariusz Osmelak | Actor | 2016 | 1 | |
| Osmarr, Otto | Otto Osmarr | Actor, Director | 1889 - 1919 | 23 | |
| Osmarr, Lili | Lili Osmarr | Actor | 1911 - 1926 | 7 | |
| Osmanov, Bahram | Bahram Osmanov | Director | 2006 | 1 | |
| Osmani, Blerim | Blerim Osmani (Блерим Османи) | Musician | 2022 | 1 | |
| Osman, E.H.L. | E.H.L. Osman | Actor | 1928 | 1 | |
| Osman, C.M. | C.M. Osman | Actor | 1928 | 1 | 1 |
| Osman Sozi | Sozi Osman | Actor | 1997 | 1 | |
| Oskui, Mahin | Mahin Oskui | Actor, Director | 1959 | 2 | 1 |
| Oskar, Otto | Otto Oskar | Actor | 1898 - 1916 | 12 | |
| Oskam, Peter | Peter Oskam | Costume Designer, Designer | 1985 | 2 | |
| Oskam, Floor | Floor Oskam | Designer | 1991 - 1992 | 14 | |
| Osjord, Elin | Elin Osjord | Actor | 1991 | 1 | |
| Osis, K. | K. Osis | Actor | 1916 | 1 | |
| Osis, Jānis | Jānis Osis | Actor, Director | 1921 - 1943 | 5 | |
| Osipovič, Jakov | Jakov Osipovič | Actor | 1926 | 1 | |
| Osipova, Nadežda | Nadežda Osipova | Designer | 2016 | 1 | |
| Osiński, Szymon | Szymon Osiński | Actor | 2007 | 4 | |
| Osinski, Aurélien | Aurélien Osinski | Actor | 2000 - 2004 | 78 | |
| Osian, Matte | Matte Osian | Actor | 2001 | 1 | |
| Oshry, Joseph, P. | Joseph P. Oshry | Lighting Designer | 2012 | 1 | |
| Oshinari, Shugo | Shugo Oshinari (忍成修吾) | Actor | 2022 | 2 | |
| Oshima, Akiko | Akiko Oshima | Dramaturg | 2009 | 1 | |
| Osgood, Erin | Erin Osgood | Actor | 2006 | 1 | |
| Osgood, Dylan | Dylan Osgood | Musician | 2018 | 1 | |
| Oseng, Ellen | Ellen Oseng | Costume Designer, Designer | 2009 | 2 | |
| Osen, Leif | Leif Osen | Musician | 2009 | 1 | |
| Ose, Victoria | Victoria Ose | Actor | 2020 | 2 | |
| Oschmann, Robert | Robert Oschmann | Actor | 2016 | 1 | |
| Oschlag, Jakob | Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | 1 |
| Oščepkov, Artur | Artur Oščepkov | Choreographer | 2013 | 1 | |
| Oscarsson, Ulrika | Ulrika Oscarsson | Actor, Musician | 2001 | 3 | |
| Oscarsson, Per | Per Oscarsson | Actor | 1950 - 1997 | 4 | |
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