| Name | Functions | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| Lisa Orberg | Actor | 1974 | 1 | |||
| Frederic-Winslow Oram | Actor | 1974 | 1 | |||
| Raymond Omodei | Designer, Director | 1974 - 2001 | 5 | |||
| Diane Orson | Musician | 1975 | 1 | |||
| Gerhard Oberschlick | Dramaturg | 1975 | 1 | |||
| Johan Ooms | Actor | 1975 | 2 | |||
| Hartmut Ostrowsky | Director | 1975 | 1 | |||
| Terence Orr | Sound Designer | 1975 | 1 | |||
| Gerhard Ohlschewski | Actor | 1975 | 2 | |||
| Kazimierz Ostrowicz | Actor | 1975 | 1 | |||
| Janusz Ostrowski | Actor | 1975 | 2 | |||
| Sally Osborn | Actor | 1975 | 1 | |||
| Sabine Otto | Actor | 1975 | 2 | |||
| Stephen Oldfield | Actor | 1975 | 1 | |||
| Carl Oatley | Actor | 1975 | 1 | |||
| Carsten Otto | Actor | 1975 - 1976 | 2 | |||
| Alekos Oudinotis | Actor | 1975 - 1985 | 5 | |||
| Želimir Orešković | Director | 1975 - 1989 | 3 | |||
| Thomas Oredsson | Actor | 1975 - 1997 | 27 | |||
| Patricia O'Connell | Actor | 1975 - 2000 | 2 | |||
| Helle Ottesen | Actor | 1975 - 2013 | 7 | |||
| Sarah Owings | Actor | 1976 | 1 | |||
| Bill Olland | Actor | 1976 | 1 | |||
| Kipp Osborne | Actor | 1976 | 1 | |||
| Erica Olivares | Actor | 1976 | 1 | |||
| Dag Otrélius | Actor | 1976 | 4 | |||
| Göran Omnéus | Actor | 1976 | 2 | |||
| Eyvind Olsen | Musician | 1976 | 1 | |||
| Barney O'Sullivan | Actor | 1976 - 1980 | 2 | |||
| Yoshitomo Ogasawara | Actor | 1976 - 1990 | 4 | |||
| Rania Oikonomidou | Actor | 1976 - 2004 | 7 | |||
| Kari Onstad | Actor | 1976 - 2018 | 60 | 5 | ||
| Thomas Oglesby | Actor | 1977 - 1980 | 2 | |||
| Stephen Oliver | Composer | 1977 - 1983 | 9 | |||
| Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | |||
| Johann Adam Oest | Actor | 1977 - 2004 | 4 | |||
| Ingunn Olsen | Actor | 1978 | 1 | |||
| Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |||
| Steinar Ofsdal | Musician | 1978 | 38 | |||
| Michiko Ohtsuka | Actor | 1978 | 1 | |||
| Kinji Obino | Actor | 1978 | 1 | |||
| Tetsushi Obino | Actor | 1978 | 1 | |||