| Ostermeier, Thomas | Thomas Ostermeier (Thomas Ostermeier) | Adaptation, Director, Translator | 2002 - 2022 | 231 | |
| O'Neil, Raymond | Raymond O'Neil (Raymond O'Neil) | Actor | 2000 | 1 | |
| Oftebro, Nils Ole | Nils Ole Oftebro (Nils Ole Oftebro) | Actor | 1970 - 2018 | 92 | |
| Ording, Jørn | Jørn Ording (Jørn Ording) | Actor, Director | 1938 - 1978 | 69 | |
| O'Malley, Flynn | Flynn O'Malley (Flynn O'Malley) | Actor | 1963 | 1 | |
| O'Connor, Terrence | Terrence O'Connor (Terrence O'Connor) | Actor | 1963 | 1 | |
| Obrtelová, Nora | Nora Obrtelová (Nora Obrtelová) | Dramaturg | 2005 | 1 | |
| Orsza-Łukasiewicz, Janina | Janina Orsza-Łukasiewicz (Janina Orsza-Łukasiewicz) | Director | 1972 | 1 | |
| Otto, Teo | Teo Otto (Teo Otto) | Costume Designer, Designer, Director | 1934 - 1959 | 14 | |
| Olsen, Kathe B. | Kathe B. Olsen (Kathe B. Olsen) | Actor | 2002 | 1 | |
| Oittinen, Tytti | Tytti Oittinen (Tytti Oittinen) | Director | 1992 - 1994 | 2 | |
| Ornäs, Gustaf Hiort, af | Gustaf Hiort af Ornäs (Gustaf Hiort af Ornäs) | Actor | 1956 | 1 | |
| Ousdal, Sverre Anker | Sverre Anker Ousdal (Sverre Anker Ousdal) | Actor | 1983 - 2020 | 40 | |
| Osterberger, - | - Osterberger (- Osterberger) | Actor | 1971 | 2 | |
| Ovčinnikova, O. | O. Ovčinnikova (O. Ovčinnikova) | Actor | 1999 - 2000 | 2 | |
| Olenina, E. | E. Olenina (E. Olenina) | Dancer | 1999 - 2000 | 2 | |
| O'Brien, Dan | Dan O'Brien (Dan O'Brien) | Designer, Lighting Designer | 2008 | 2 | |
| Oriane, Francoise | Francoise Oriane (Francoise Oriane) | Actor | 1984 | 1 | |
| O'Connell, Deirdre | Deirdre O'Connell (Deirdre O'Connell) | Actor, Director | 1971 - 1985 | 6 | |
| O'Connor, Kaleigh | Kaleigh O'Connor (Kaleigh O'Connor) | Actor | 2002 | 1 | |
| O'Connor, Savannah | Savannah O'Connor (Savannah O'Connor) | Actor | 2002 | 1 | |
| O'Kelly, Geri | Geri O'Kelly (Geri O'Kelly) | Choreographer | 1993 | 1 | |
| Oppi, Frk. | Frk. Oppi (Frk. Oppi) | Actor | 1941 | 1 | |
| O'Neil, Sally | Sally O'Neil (Sally O'Neil) | Actor | 1939 | 1 | |
| O'Connor, John | John O'Connor (John O'Connor) | Director | 2003 | 1 | |
| O'Clery, Joan | Joan O'Clery (Joan O'Clery) | Costume Designer | 2000 - 2013 | 6 | |
| O'Brien, Peter | Peter O'Brien (Peter O'Brien) | Actor | 2002 | 1 | |
| O'Connell Bak, Dennis | Dennis O'Connell Bak (Dennis O'Connell Bak) | Actor | 2006 | 1 | |
| Ongjerth, Richárd | Richárd Ongjerth (Richárd Ongjerth) | Actor | 1960 | 1 | |
| Oanh, Tú | Tú Oanh (Tú Oanh) | Actor | 2006 - 2010 | 2 | |
| O'Foghludha, Michael | Michael O'Foghludha (Michael O'Foghludha) | Actor | 2001 | 1 | |
| O'Kane, Nancy | Nancy O'Kane (Nancy O'Kane) | Actor | 1952 - 1961 | 2 | |
| O'Brien, Timothy | Timothy O'Brien (Timothy O'Brien) | Costume Designer, Designer | 1964 - 1996 | 12 | |
| Olesen, Maggie | Maggie Olesen (Maggie Olesen) | Actor | 1971 | 1 | |
| O'Callaghan, Brenainn | Brenainn O'Callaghan (Brenainn O'Callaghan) | Actor | 2000 | 1 | |
| Oitana, Ricky | Ricky Oitana (Ricky Oitana) | Actor | 1996 | 2 | |
| O'Brien, James | James O'Brien (James O'Brien) | Actor | 1957 - 1971 | 2 | |
| O'Connell, Patricia | Patricia O'Connell (Patricia O'Connell) | Actor | 1975 - 2000 | 2 | |
| Orr, Lynn E. | Lynn E. Orr (Lynn E. Orr) | Designer, Director, Lighting Designer | 1937 | 3 | |
| Oosthout, Nelly | Nelly Oosthout (Nelly Oosthout) | Actor | 1928 - 1930 | 2 | |
| O'Connell, Carol | Carol O'Connell (Carol O'Connell) | Actor | 1963 | 1 | |
| Opffer, Yvonne | Yvonne Opffer (Yvonne Opffer) | Actor | 1987 | 1 | |
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