| Ottesen, Rigmor | Rigmor Ottesen | Actor | 1992 - 2007 | 32 | |
| Okun, Alexander | Alexander Okun | Designer | 1992 - 2003 | 3 | 1 |
| Orvelius, Gunilla | Gunilla Orvelius | Actor | 1992 - 2002 | 27 | 1 |
| Ottmann, Anna | Anna Ottmann | Actor | 1992 - 2000 | 3 | 1 |
| Op gen Orth, Helga | Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |
| Oittinen, Tytti | Tytti Oittinen | Director | 1992 - 1994 | 2 | 1 |
| Ouedraogo, Marceline | Marceline Ouedraogo | Actor | 1992 | 1 | |
| Olszewski, Zbigniew | Zbigniew Olszewski | Actor | 1992 | 2 | |
| Oman, Tine | Tine Oman | Actor | 1992 | 1 | |
| Olivere, Marc | Marc Olivere | Lighting Designer | 1992 | 1 | |
| Otto, Gabriele | Gabriele Otto | Dramaturg | 1992 | 1 | |
| Oosthoek, Peter | Peter Oosthoek | Actor | 1992 | 1 | |
| Ospelt, Ingo | Ingo Ospelt | Actor | 1992 | 1 | |
| Olich, Michael | Michael Olich | Costume Designer | 1992 | 1 | |
| Ozoliņa, Lilita | Lilita Ozoliņa | Actor | 1992 | 1 | |
| Otto, Annie | Annie Otto | Actor | 1992 | 1 | |
| Oimori, Reiko | Reiko Oimori | Actor | 1992 | 1 | |
| Ouwehand, Roos | Roos Ouwehand | Actor | 1992 | 1 | |
| Offermans, Sylvia | Sylvia Offermans | Actor | 1992 | 1 | |
| Ohla, Johannes | Johannes Ohla | Mask Maker | 1992 | 1 | |
| Obermüller, Ulrike | Ulrike Obermüller | Costume Designer | 1991 - 2016 | 2 | |
| Ostendorf, Josef | Josef Ostendorf | Actor | 1991 - 2016 | 8 | |
| Olsoni, Kristin | Kristin Olsoni | Assistant Director | 1991 - 2006 | 2 | |
| Oskam, Floor | Floor Oskam | Designer | 1991 - 1992 | 14 | |
| Overbeeke, Adri | Adri Overbeeke | Actor | 1991 - 1992 | 84 | |
| Ohtake, Shinobu | Shinobu Ohtake | Actor | 1991 | 1 | |
| Osjord, Elin | Elin Osjord | Actor | 1991 | 1 | |
| Orsman, Neil | Neil Orsman | Actor | 1991 | 1 | |
| Otto, Eva | Eva Otto | Actor | 1991 | 2 | |
| Otis, James | James Otis | Actor | 1991 | 1 | |
| O'Brien, Doc | Doc O'Brien | Actor | 1991 | 6 | |
| Onofri, Stefano | Stefano Onofri | Actor | 1991 | 1 | |
| O´Byrne, Louis | Louis O´Byrne | Designer | 1991 | 1 | |
| Ormsby, Robert | Robert Ormsby | Actor | 1991 | 1 | |
| Olsen, Trevor H. | Trevor H. Olsen | Actor | 1991 | 1 | 1 |
| Obermann, Frank | Frank Obermann | Actor | 1991 | 1 | |
| Okazaki, Shinobu | Shinobu Okazaki | Designer | 1991 | 1 | |
| Ohsawa, Kaoru | Kaoru Ohsawa | Lighting Designer | 1991 | 1 | |
| Obrecht, Urs | Urs Obrecht | Actor | 1991 | 1 | |
| Oldani, Claudio | Claudio Oldani | Director | 1991 | 1 | |
| O'Brien, Jack | Jack O'Brien | Director | 1990 - 2025 | 2 | 1 |
| Ojamaa, Pekka | Pekka Ojamaa | Costume Designer, Designer | 1990 - 2001 | 9 | |
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