| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Ruth Olsén | Actor | 1995 | 5 | |||
| H. Kevin Opela | Actor | 1996 | 1 | |||
| Christof Oswald | Actor | 1996 | 1 | |||
| Giuseppe Oristânio | Actor | 1997 - 1998 | 3 | |||
| Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 - 1998 | 15 | |||
| Brigitte Oessling | Actor | 1995 | 1 | |||
| David Oldman | Designer | 1996 | 1 | |||
| Bartosz Opania | Actor | 1997 | 1 | |||
| Marika Ohlsson | Actor | 1997 | 2 | |||
| Adriaan Olree | Actor | 1996 | 1 | |||
| Ken Ohara | Actor | 1996 - 1997 | 2 | |||
| Majvor Olsson | Actor | 1997 | 1 | |||
| Kurt Olsson | Actor | 1997 | 1 | |||
| Inge Olsson | Actor | 1997 | 2 | |||
| Yehiel Orgal | Lighting Designer | 1995 | 1 | |||
| Ryoichi Ohkubo | Actor, Director, Translator | 1996 - 2006 | 4 | |||
| Yoko Onizawa | Sound Designer | 1996 | 1 | |||
| Heinz Ostermann | Actor | 1995 | 1 | |||
| Simone Ott | Actor | 1995 | 4 | |||
| Minni Oehl | Actor | 1995 | 6 | |||
| Jakub Ostaszewski | Composer | 1995 | 1 | |||
| Yean Olsson | Actor, Costume Designer | 1997 | 4 | |||
| Nicholas Olsson | Actor | 1996 - 1997 | 2 | |||
| Tamae Ohnishi | Actor | 1995 | 1 | |||
| Karen Oberlin | Actor | 1995 | 1 | |||
| S. Orlac | Director | 1995 | 1 | |||
| Heidemarie Otte | Mask Maker | 2002 | 1 | |||
| Gianfranco Ombuen | Actor | 1967 - 1969 | 3 | |||
| Jiří Olijnyk | Actor | 1969 | 1 | |||
| Mathew O'Sullivan | Actor | 1969 | 1 | |||
| Gustav Opočenský | Actor | 1969 | 1 | |||
| Warwick Ongley | Director | 1969 | 1 | |||
| Edward Ożana | Actor | 1970 - 1975 | 2 | |||
| Vera Oelschlegel | Director | 1997 - 2000 | 52 | |||
| Rune Ottoson | Actor | 1969 | 1 | |||
| Stanislav Oubram | Actor | 1969 - 2006 | 2 | |||
| Mark O’Rowe | Adaptation, Director | 2015 - 2023 | 2 | |||
| Peter O’Brien | Costume Designer | 2015 | 1 | |||
| Syusaku Ohtake | Actor | 1997 | 1 | |||
| Sara Otermin | Actor | 1997 | 1 | |||
| Martin Olbertz | Actor | 1997 | 1 | |||
| Petra Ottl | Actor | 1997 | 1 | |||