| Otegui, Juan José | Juan José Otegui | Actor | 1969 | 1 | |
| O'Wisiedo, Mayrata | Mayrata O'Wisiedo | Actor | 1968 | 1 | |
| Ojea, Paca | Paca Ojea | Actor | 2001 | 1 | |
| Otxoa, Iñaki | Iñaki Otxoa | Actor | 1987 | 1 | |
| Okafor, Amaka | Amaka Okafor | Actor | 2020 | 1 | |
| O'Connor, Hugh | Hugh O'Connor | Designer | 2014 | 1 | |
| Oladejo, Oyin | Oyin Oladejo | Actor | 2016 | 1 | |
| Olsen, Kim, Jøran | Kim Jøran Olsen | Actor | 2020 | 1 | |
| Osipova, Nadežda | Nadežda Osipova | Designer | 2016 | 1 | |
| Oščepkov, Artur | Artur Oščepkov | Choreographer | 2013 | 1 | |
| Ostrovskaja, Ljubov' | Ljubov' Ostrovskaja | Actor | 2020 | 1 | |
| Omidi, Hossein | Hossein Omidi | Actor | 2013 | 1 | |
| Omrani, Mohammad | Mohammad Omrani | Actor | 2006 | 1 | |
| Omidi, Elena | Elena Omidi | Actor | 2019 | 1 | |
| Ouzeau, Bruno | Bruno Ouzeau | Actor | 2020 | 1 | |
| Olafsson, Emil | Emil Olafsson | Actor | 2020 | 1 | |
| Odağ, Efsane | Efsane Odağ | Assistant Director | 2019 | 1 | |
| Omoto, Luka | Luka Omoto | Actor | 2006 | 1 | |
| Obert, Gerti | Gerti Obert | Actor | 1935 | 1 | |
| Olshin, Abigail | Abigail Olshin | Actor | 2020 | 1 | |
| Orii, Akitsu | Akitsu Orii | Musician | 2013 | 1 | |
| Ohnemus, Chris | Chris Ohnemus | Dramaturg | 1999 - 2000 | 2 | |
| Oikonomopoulou, Pepi | Pepi Oikonomopoulou | Adaptation, Director | 2006 | 2 | |
| Olchowska, (Nuna) Młodziejowska | (Nuna) Młodziejowska Olchowska | Actor | 1905 - 1907 | 2 | |
| Ollén, Gunnar, | Gunnar Ollén | Adaptation | 1947 - 2005 | 2 | |
| Omdal, Odin Hørthe, | Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | |
| Orchis, Isella | Isella Orchis | Actor | 1993 | 2 | |
| Organ, Alex | Alex Organ | Actor, Sound Designer | 2002 | 2 | |
| Osborne, Si | Si Osborne | Actor | 2001 | 2 | |
| Osswald, Leni | Leni Osswald | Costume Designer | 1955 - 1962 | 2 | |
| Ostermayer, Christine | Christine Ostermayer | Actor | 1965 - 1969 | 2 | |
| Oswald, Axsel | Axsel Oswald | Actor | 1936 - 1937 | 2 | |
| Ourth, Georges | Georges Ourth | Actor, Director | 1978 - 1984 | 2 | |
| Oittinen, Tytti, | Tytti Oittinen | Director | 1992 - 1994 | 2 | |
| Osterberger, -, | - Osterberger | Actor | 1971 | 2 | |
| Ovčinnikova, O. | O. Ovčinnikova | Actor | 1999 - 2000 | 2 | |
| Olenina, E. | E. Olenina | Dancer | 1999 - 2000 | 2 | |
| O'Brien, Dan | Dan O'Brien | Designer, Lighting Designer | 2008 | 2 | |
| Oanh, Tú | Tú Oanh | Actor | 2006 - 2010 | 2 | |
| O'Kane, Nancy | Nancy O'Kane | Actor | 1952 - 1961 | 2 | |
| Oitana, Ricky, | Ricky Oitana | Actor | 1996 | 2 | |
| O'Brien, James | James O'Brien | Actor | 1957 - 1971 | 2 | |
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