| Name | Functions | Event Dates  | Events | Resources | ||
|---|---|---|---|---|---|---|
| Sándor Oszter | Actor | 1978 - 2007 | 2 | 1 | ||
| Marianne Owen | Actor | 1978 - 1996 | 4 | |||
| Robert Ornbo | Lighting Designer | 1978 - 1987 | 2 | 1 | ||
| Helli Ohnesorge | Actor | 1978 - 1986 | 2 | |||
| Georges Ourth | Actor, Director | 1978 - 1984 | 2 | |||
| Hisako Ohkata | Actor | 1978 - 1983 | 2 | |||
| Michael Ogilvie | Actor | 1978 - 1982 | 4 | |||
| Ingunn Olsen | Actor | 1978 | 1 | |||
| Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |||
| Steinar Ofsdal | Musician | 1978 | 38 | 1 | ||
| Michiko Ohtsuka | Actor | 1978 | 1 | |||
| Kinji Obino | Actor | 1978 | 1 | |||
| Tetsushi Obino | Actor | 1978 | 1 | |||
| Yachiyo Ohtori | Actor | 1978 | 1 | |||
| Anne Oostveen | Actor | 1978 | 1 | |||
| Stephen Oliver | Actor, Composer | 1977 - 2024 | 10 | |||
| Johann Adam Oest | Actor | 1977 - 2004 | 4 | 1 | ||
| Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | 1 | ||
| Thomas Oglesby | Actor | 1977 - 1980 | 2 | 1 | ||
| Corrado Olmi | Actor | 1977 - 1978 | 8 | |||
| Kari Onstad | Actor | 1976 - 2018 | 60 | 6 | ||
| Rania Oikonomidou | Actor | 1976 - 2004 | 7 | |||
| Yoshitomo Ogasawara | Actor | 1976 - 1990 | 4 | |||
| Barney O'Sullivan | Actor | 1976 - 1980 | 2 | |||
| Sarah Owings | Actor | 1976 | 1 | |||
| Bill Olland | Actor | 1976 | 1 | |||
| Kipp Osborne | Actor | 1976 | 1 | 1 | ||
| Erica Olivares | Actor | 1976 | 1 | |||
| Dag Otrélius | Actor | 1976 | 4 | |||
| Göran Omnéus | Actor | 1976 | 2 | |||
| Eyvind Olsen | Musician | 1976 | 1 | |||
| Helle Ottesen | Actor | 1975 - 2021 | 9 | 1 | ||
| Patricia O'Connell | Actor | 1975 - 2000 | 2 | |||
| Thomas Oredsson | Actor | 1975 - 1997 | 27 | |||
| Želimir Orešković | Director | 1975 - 1989 | 3 | 1 | ||
| Alekos Oudinotis | Actor | 1975 - 1985 | 5 | |||
| Johan Ooms | Actor | 1975 - 1981 | 3 | |||
| Armando Ocano | Adaptation | 1975 - 1980 | 5 | |||
| Carsten Otto | Actor | 1975 - 1976 | 2 | |||
| Diane Orson | Musician | 1975 | 1 | |||
| Gerhard Oberschlick | Dramaturg | 1975 | 1 | |||
| Hartmut Ostrowsky | Director | 1975 | 1 | |||