| 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 | |
| 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 | |
| Ojamaa, Pekka | Pekka Ojamaa | Costume Designer, Designer | 1990 - 2001 | 9 | |
| Opfinger, Heinz | Heinz Opfinger | Actor | 1990 - 1991 | 2 | |
| Oleniacz, Tom | Tom Oleniacz | Actor | 1990 | 1 | |
| O'Brien, Jack | Jack O'Brien | Director | 1990 | 1 | |
| O'Reilly, Imelda | Imelda O'Reilly | Actor | 1990 | 1 | |
| Opitz, E. | E. Opitz | Actor | 1990 | 1 | |
| Olsson, Ecke | Ecke Olsson | Actor | 1990 | 1 | |
| Olson, Stephan | Stephan Olson | Designer | 1990 | 1 | |
| Otter, Karl | Karl Otter | Actor | 1990 | 1 | |
| Olschewski, Gerhard | Gerhard Olschewski | Actor | 1990 | 1 | |
| Ohlsson, Lotta | Lotta Ohlsson | Actor | 1990 | 2 | |
| Oscarsson, Kjell | Kjell Oscarsson | Actor | 1990 | 2 | |
| Omundson, Timothy | Timothy Omundson | Actor | 1990 | 1 | |
| Ormerod, Nick | Nick Ormerod | Designer | 1990 | 1 | |
| Otto, Victoria | Victoria Otto | Actor | 1990 | 2 | |
| O'Connor, Paul, Vincent | Paul Vincent O'Connor | Actor | 1990 | 3 | |
| Okamoto, Kennichi | Kennichi Okamoto | Actor | 1990 | 1 | |
| Ohki, Yu | Yu Ohki | Actor | 1990 | 1 | |
| Obara, Makoto | Makoto Obara | Sound Designer | 1990 | 1 | |
| Oguri, Yuriko | Yuriko Oguri | Actor | 1990 | 1 | |
| Omar, Ala | Ala Omar | Actor | 1990 | 1 | |
| Oeser, Wolf | Wolf Oeser | Actor | 1989 - 1994 | 6 | |
| O'Malley, Geraldine | Geraldine O'Malley | Costume Designer, Designer | 1989 - 1990 | 4 | |
| Oberthür, Martina | Martina Oberthür | Actor | 1989 | 4 | |
| Osborne, Duncan | Duncan Osborne | Actor | 1989 | 1 | |
| O'Neill, Errol | Errol O'Neill | Actor | 1989 | 1 | |
| Ondra, Otto | Otto Ondra | Actor | 1989 | 1 | |
| Olschok, Herbert | Herbert Olschok | Director | 1988 - 2014 | 5 | |
| Ornest, Jiří | Jiří Ornest | Actor | 1988 - 2012 | 2 | |
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