| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Heinz Opfinger | Actor | 1990 - 1991 | 2 | |||
| Robert Ormsby | Actor | 1991 | 1 | |||
| Victoria Otto | Actor | 1990 | 2 | |||
| Paul Vincent O'Connor | Actor | 1990 | 3 | |||
| Kennichi Okamoto | Actor | 1990 | 1 | |||
| Yu Ohki | Actor | 1990 | 1 | |||
| Marc Olivere | Lighting Designer | 1992 | 1 | |||
| Gabriele Otto | Dramaturg | 1992 | 1 | |||
| Peter Oosthoek | Actor | 1992 | 1 | |||
| Ingo Ospelt | Actor | 1992 | 1 | |||
| Michael Olich | Costume Designer | 1992 | 1 | |||
| Lilita Ozoliņa | Actor | 1992 | 1 | |||
| Frank Obermann | Actor | 1991 | 1 | |||
| Annie Otto | Actor | 1992 | 1 | |||
| Mark O´Regan | Actor | 1988 | 5 | |||
| Jiří Ornest | Actor | 1988 - 2012 | 2 | |||
| Gerd Opitz | Actor | 1988 | 1 | |||
| Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |||
| Reiko Oimori | Actor | 1992 | 1 | |||
| Francisco Olmo | Actor | 1982 | 3 | |||
| Roos Ouwehand | Actor | 1992 | 1 | |||
| Sylvia Offermans | Actor | 1992 | 1 | |||
| Wolf Oeser | Actor | 1989 - 1994 | 6 | |||
| Robert O'Mahoney | Actor, Author | 1982 - 1991 | 10 | |||
| Molly O'Neill | Actor | 1993 | 1 | |||
| Joan Orenstein | Actor | 1981 - 1991 | 3 | |||
| David Oswald | Director | 1993 | 1 | |||
| Birgit Oswald | Actor | 1993 | 1 | |||
| Tony O'Brien | Actor | 1993 | 1 | |||
| Dietmar Obst | Actor | 1993 - 1999 | 2 | |||
| Shinobu Okazaki | Designer | 1991 | 1 | |||
| Kaoru Ohsawa | Lighting Designer | 1991 | 1 | |||
| Urs Obrecht | Actor | 1991 | 1 | |||
| Veerle van Overloop | Actor | 1993 | 1 | |||
| Hans Ollinger | Actor | 1993 | 1 | |||
| Jens Ochlast | Actor | 1993 - 2015 | 3 | |||
| Dieter Oberholz | Actor | 1993 - 2004 | 3 | |||
| Annelie Ottosson | Actor | 1993 | 2 | |||
| Floor Oskam | Designer | 1991 - 1992 | 14 | |||
| Adri Overbeeke | Actor | 1991 - 1992 | 84 | |||
| Miranta Oikonomidou | Actor | 1965 - 1994 | 4 | |||
| Stephen Oliver | Composer | 1977 - 1983 | 9 | |||