| Name | Functions | Event Dates  | Events | Resources | ||
|---|---|---|---|---|---|---|
| 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 | |||
| 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 | |||
| Biljana Ostojic | Director | 1975 | 1 | |||
| Ramón Oteyza | Actor | 1975 | 1 | |||
| Raymond Omodei | Designer, Director | 1974 - 2001 | 5 | |||
| José Ochoa | Adaptation, Director | 1974 - 1975 | 10 | |||
| Lisa Orberg | Actor | 1974 | 1 | |||
| Frederic-Winslow Oram | Actor | 1974 | 1 | |||
| Pierre Oudrey | Actor | 1973 | 1 | |||
| Elżbieta Osterwianka | Actor | 1973 | 1 | |||
| Patrick O'Gara | Actor | 1973 | 1 | |||
| Ingrid Oesterhelt | Actor | 1973 | 1 | |||
| Klaus Oelmann | Actor | 1973 | 1 | |||
| Paul Orgill | Actor | 1973 | 1 | |||
| Cecile O'Connor | Actor | 1973 | 7 | |||
| Eva Opaker | Actor | 1973 | 1 | 1 | ||
| Marshall Oglesby | Director | 1973 | 1 | |||
| Wilfried Ortmann | Actor | 1973 | 1 | 1 | ||
| John Osborne | Adaptation, Translator | 1972 - 2011 | 8 | 1 | ||
| Jaroslava Obermaierová | Actor | 1972 - 2006 | 2 | |||
| György Orbán | Composer | 1972 - 2002 | 2 | 1 | ||