| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Sonja Oppenhagen | Actor | 1982 - 1993 | 4 | 1 | ||
| Alejandra Oviedo | Actor | 2012 - 2013 | 3 | 1 | ||
| Judith Olauson | Actor | 1984 | 1 | 1 | ||
| Christopher Oden | Actor, Director | 1984 - 2001 | 6 | 1 | ||
| L'ubica Obuchová | Costume Designer | 1985 | 1 | 1 | ||
| Trygve Olsen | Lighting Designer | 1985 - 1987 | 3 | 1 | ||
| Robert Ornbo | Lighting Designer | 1978 - 1987 | 2 | 1 | ||
| Jack O'Brien | Director | 1990 | 1 | 1 | ||
| Daniel O'Brien | Actor | 2012 | 1 | 1 | ||
| Nick Ormerod | Designer | 1990 | 1 | 1 | ||
| Trevor H. Olsen | Actor | 1991 | 1 | 1 | ||
| Anna Ottmann | Actor | 1992 - 2000 | 3 | 1 | ||
| Natalie Ogle | Actor | 1988 | 1 | 1 | ||
| Brendan O'Hea | Actor | 1993 - 1999 | 6 | 1 | ||
| Bulle Ogier | Actor | 1993 | 4 | 1 | ||
| Ádám Ottlik | Actor | 1996 - 2008 | 2 | 1 | ||
| Ruth Orthmann | Translator | 1994 | 1 | 1 | ||
| Friederike Ott | Actor | 2014 - 2016 | 12 | 1 | ||
| David Osmond | Actor | 2012 | 1 | 1 | ||
| Patrick O'Kane | Actor | 2000 | 1 | 1 | ||
| Thomas Oglesby | Actor | 1977 - 1980 | 2 | 1 | ||
| Huguette Oligny | Actor | 1996 | 1 | 1 | ||
| Louise Søeborg Ohlsen | Actor | 1995 | 1 | 1 | ||
| Gisèle Oudart | Actor | 1969 | 1 | 1 | ||
| Cornelius Oswald | Designer | 2014 | 1 | 1 | ||
| Owen Oakeshott | Actor | 2013 - 2014 | 11 | 1 | ||
| Sándor Oszter | Actor | 1978 - 2007 | 2 | 1 | ||
| Éva Olsavszky | Actor | 2002 | 1 | 1 | ||
| György Orbán | Composer | 1972 - 2002 | 2 | 1 | ||
| Philipp Otto | Actor | 2002 - 2015 | 11 | 1 | ||
| Michael Oggenfuss | Designer, Lighting Designer | 2002 - 2004 | 66 | 1 | ||
| Josh Odor | Actor | 2002 | 1 | 1 | ||
| Valerie Oberhof | Actor | 2002 - 2012 | 6 | 1 | ||
| Cecilia Osztovits | Adaptation | 2002 | 1 | 1 | ||
| Nancy Odyja-Thacker | Actor | 2003 | 1 | 1 | ||
| Ann Sofie Oxenvad | Adaptation | 2003 | 1 | 1 | ||
| Errol O'Neill | Actor | 1989 | 1 | 1 | ||
| Thomas Oberender | Dramaturg | 2003 - 2004 | 6 | 1 | ||
| Kelly Overton | Actor | 2001 | 1 | 1 | ||
| Marette Oppenberg | Costume Designer | 2003 | 2 | 1 | ||
| Okwui Okpokwasili | Actor | 2003 - 2010 | 3 | 1 | ||
| David Owe | Actor | 2004 | 1 | 1 | ||