| Olsen, Kristoffer | Kristoffer Olsen | Actor | 2024 | 1 | |
| Orlandelli, Paolo | Paolo Orlandelli | Assistant Director | 2019 | 1 | |
| Okawa, Tamaki | Tamaki Okawa (Ōkawa Tamaki / 大川珠季) | Dramaturg, Translator | 2024 | 2 | |
| Oppi, Giulio | Giulio Oppi | Actor | 1948 - 1949 | 2 | |
| Olmi, Corrado | Corrado Olmi | Actor | 1977 - 1978 | 8 | |
| Orsini, Luca | Luca Orsini | Assistant Director | 2015 | 1 | |
| Olding, Francesca | Francesca Olding | Actor | 1980 | 3 | |
| Olding, Federico | Federico Olding | Actor | 1980 | 3 | |
| Oliveira, María Clara | María Clara Oliveira | Actor | 2024 | 1 | |
| Orlandini, Gianluca | Gianluca Orlandini | Director | 2003 | 1 | |
| Onnis, Valeria | Valeria Onnis | Costume Designer | 2012 | 2 | |
| Otieno, Mercy Dorcas | Mercy Dorcas Otieno | Actor | 2021 | 2 | |
| Obinu, Gianfranco Onatziro | Gianfranco Onatziro Obinu | Actor | 2015 - 2019 | 3 | |
| Oldani, Claudio | Claudio Oldani | Director | 1991 | 1 | |
| Ori, Benedetta | Benedetta Ori | Actor | 1999 | 2 | |
| Orlandini, Veronica | Veronica Orlandini | Actor | 2015 | 1 | |
| Olivari, Michela | Michela Olivari | Actor | 2018 | 1 | |
| Ornaghi, Simona | Simona Ornaghi | Lighting Designer | 2018 | 2 | |
| Olvera, Omar | Omar Olvera | Director | 2024 | 1 | |
| Olmedo, Darinka | Darinka Olmedo | Actor | 2024 | 1 | |
| Owen, Constance | Constance Owen | Actor | 2024 | 1 | |
| O'Reilly, Kiera Lee | Kiera Lee O'Reilly | Dancer | 2024 | 1 | |
| Otrębski , Grzegorz | Grzegorz Otrębski | Actor | 2022 | 1 | |
| Oramusc, Anna | Anna Oramusc | Costume Designer | 2022 | 1 | |
| Oliboni, Héctor Di | Héctor Di Oliboni | Adaptation, Director | | 2 | |
| Otterson, Jed | Jed Otterson | Actor | 2024 | 1 | |
| Ocampo-Morales, Leo | Leo Ocampo-Morales | Set Designer | 2024 | 1 | |
| O’Leary, Helen | Helen O’Leary | Actor | 2018 | 1 | |
| Ogurlieva, Irina | Irina Ogurlieva (Ирина Огурлиева) | Choreographer | 2024 | 1 | |
| Olson, Grant | Grant Olson | Director | 2024 | 1 | |
| Oenslager, Donald | Donald Oenslager | Costume Designer, Designer, Lighting Designer | 1934 - 1951 | 19 | 1 |
| Orloff, Nicholas | Nicholas Orloff | Actor | 1908 | 1 | 1 |
| Olsen, Inga | Inga Olsen | Actor | 1877 - 1908 | 101 | 1 |
| Oberkogler, Cornelia | Cornelia Oberkogler | Actor | 1959 | 1 | 1 |
| Oddvar, August | August Oddvar | Actor | 1900 - 1954 | 108 | 1 |
| Off, Marcus | Marcus Off | Actor | 2002 | 1 | 1 |
| Okun, Alexander | Alexander Okun | Designer | 1992 - 2003 | 3 | 1 |
| Olivar, César | César Olivar | Costume Designer | 2004 | 1 | 1 |
| Ollén, Gunnar | Gunnar Ollén | Adaptation | 1947 - 2005 | 2 | 1 |
| Olsson, Lennart | Lennart Olsson | Director | 1971 - 1987 | 4 | 1 |
| Olsten, Agnieszka | Agnieszka Olsten | Director | 2006 - 2009 | 7 | 1 |
| Omdal, Odin Hørthe | Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | 1 |
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