| Orrell, Xenia | Xenia Orrell | Actor | 1940 | 1 | |
| O'Connell, Alice | Alice O'Connell | Actor | 1940 | 2 | |
| O'Leary, Muriel | Muriel O'Leary | Actor | 1940 | 1 | |
| Overton, Frank | Frank Overton | Actor | 1941 | 1 | |
| Ostrow, Isa | Isa Ostrow | Actor | 1941 | 1 | |
| Onyejekwe, Uton | Uton Onyejekwe | Actor | 2017 | 1 | |
| Olson, Norman | Norman Olson | Actor | 1942 | 1 | |
| Olsson, Tore | Tore Olsson | Actor | 1943 | 1 | |
| Orfanos, Lampros | Lampros Orfanos | Costume Designer, Designer | 1943 | 2 | |
| Ousey, Timmy | Timmy Ousey | Actor | 1971 | 1 | |
| Otero, Clementina | Clementina Otero | Actor | 1944 | 1 | |
| Orkin, Andre | Andre Orkin | Actor | 1944 | 1 | |
| Outhwaite, Walter | Walter Outhwaite | Actor | 1944 | 1 | |
| Ondruch, Pavel | Pavel Ondruch | Director | 2016 | 1 | |
| Osmelak, Mariusz | Mariusz Osmelak | Actor | 2016 | 1 | |
| Okito, Takashi | Takashi Okito | Actor | 2016 - 2018 | 4 | |
| Ogawa, Atsuko | Atsuko Ogawa | Actor | 2016 | 1 | |
| Oberlin, Dorothy | Dorothy Oberlin | Actor | 1945 | 1 | |
| O'Reilly, Sheila | Sheila O'Reilly | Actor | 1945 | 1 | |
| O'Brien, Maurice | Maurice O'Brien | Actor | 1945 | 1 | |
| O'Brien, Kay | Kay O'Brien | Actor | 1945 | 1 | |
| Olsson, Gunnar | Gunnar Olsson | Actor | 1946 | 1 | |
| Orell, Heinrich | Heinrich Orell | Actor, Director | 1911 | 2 | |
| O'Connor, Declan | Declan O'Connor | Actor | 2017 | 1 | |
| O'Connell, Janine | Janine O'Connell | Actor | 1971 | 1 | |
| O'Connell, Richard | Richard O'Connell | Director | 1947 | 2 | |
| Ostrander, Ruth | Ruth Ostrander | Actor | 1947 | 1 | |
| Oldfield, Ben | Ben Oldfield | Actor | 2000 | 1 | |
| Oppermann, Peter | Peter Oppermann | Dramaturg | 2000 | 1 | |
| Oehmig, Franz | Franz Oehmig | Actor | 1900 | 1 | |
| O'Neil, Randall | Randall O'Neil | Designer | 1948 | 1 | |
| Orwoll, Styrk | Styrk Orwoll | Actor | 1948 | 1 | |
| Ohlin, Nils | Nils Ohlin | Actor | 1948 | 1 | |
| O'Reilly, Alpho | Alpho O'Reilly | Actor | 1948 | 1 | |
| Orfanidis, Stelios | Stelios Orfanidis | Designer | 1949 | 1 | |
| Oglesby, Ethel | Ethel Oglesby | Actor | 1949 | 1 | |
| O'Sullivan, Eugenie | Eugenie O'Sullivan | Director | 1949 | 1 | |
| O'Connor, Tim | Tim O'Connor | Actor | 1949 | 1 | |
| O'Malley, Tom | Tom O'Malley | Actor | 1949 | 4 | |
| Orlov, Aleksandr | Aleksandr Orlov | Actor | 2000 | 1 | |
| Olsen, Lisbeth-Anita, Grimsø | Lisbeth-Anita Grimsø Olsen | Dancer | 2017 | 1 | |
| Orliński, Bolesław | Bolesław Orliński | Actor | 1923 | 1 | |
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