| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Kevin Orzechowski | Actor | 2001 | 1 | |||
| Robert A. O'Connell | Director | 2003 | 1 | |||
| Paul Ocampo | Actor, Dancer | 2001 | 2 | |||
| Scott O’Brien | Composer | 2001 | 1 | |||
| Fran Overbury | Actor, Musical Director | 2001 | 5 | |||
| John Owens | Sound Designer | 2003 | 4 | |||
| Thomas Oerlemans | Actor | 2003 | 1 | |||
| Yumiko Oyama | Actor | 1998 - 2001 | 4 | |||
| Anna Oliver | Costume Designer | 1999 - 2010 | 3 | |||
| Bart Opsomer | Actor | 2001 | 1 | |||
| Stephen Oldfield | Actor | 1975 | 1 | |||
| Joseph O'Keefe | Actor | 2001 | 1 | |||
| Harold O'Leary | Actor | 2003 | 1 | |||
| Michael Ouellette | Actor | 2003 | 1 | |||
| Tanja Oetterli | Actor | 2003 | 6 | |||
| Attila Orbán | Actor | 2008 | 5 | |||
| Damian O'Hare | Actor | 2003 | 1 | |||
| Štěpán Otčenášek | Dramaturg | 2013 | 3 | |||
| Owen O'Kane | Actor | 2003 | 1 | |||
| Tom O'Connor | Actor | 2003 | 1 | |||
| Karen Ott | Dramaturg | 2003 | 1 | |||
| Katharina Orthmeyer | Actor | 2004 | 1 | |||
| Florian Odendahl | Actor | 2004 - 2005 | 15 | |||
| Max Osborne | Actor | 2004 | 1 | |||
| Janet Osborne | Actor | 2004 | 1 | |||
| Cendrine Orcier | Actor | 2004 - 2005 | 63 | |||
| Fabien Orcier | Actor | 2004 - 2005 | 72 | |||
| Sylvie Orcier | Designer | 2004 - 2005 | 9 | |||
| Sara O’Connell | Actor, Choreographer, Dancer | 2004 | 4 | |||
| Tom Oakes | Actor | 2004 | 1 | |||
| Terje Olden | Actor | 2004 | 2 | |||
| Katherine O´Neill | Actor | 2004 | 1 | |||
| Tim O'Hare | Designer | 2004 | 1 | |||
| Katherine O'Neill | Choreographer | 2004 | 1 | |||
| Cristina Odasso | Actor | 2005 - 2006 | 19 | |||
| Vera Obradović | Choreographer | 2005 | 1 | |||
| Shelley O'Brien | Actor | 2005 | 7 | |||
| Otto Ondra | Actor | 1989 | 1 | |||
| Drahomír Ožana | Actor | 1965 | 1 | |||
| Ota Ornest | Actor | 1946 | 1 | |||
| Andrew David Ostrowski | Lighting Designer | 2005 - 2007 | 2 | |||
| Lyudmila Odiyankova | Actor | 2005 | 1 | |||