| Ostermann, Ferdinand | Ferdinand Ostermann | Actor | 1933 | 1 | |
| Olsen, Karl Gustav | Karl Gustav Olsen | Actor | 1933 | 1 | |
| Overman, Frederick | Frederick Overman | Actor | 1933 | 1 | |
| Orlović, Mara | Mara Orlović | Actor | 1933 | 1 | |
| Orlović, Milan | Milan Orlović | Actor | 1933 | 1 | |
| Orlova, Olga | Olga Orlova | Actor | 1933 | 1 | |
| Osvald, Aksel | Aksel Osvald | Actor | 1933 - 1935 | 3 | |
| Okada, Inosuke | Inosuke Okada | Lighting Designer | 1934 | 1 | |
| Olsson, Cissi | Cissi Olsson | Actor | 1934 | 1 | |
| Olinger, Thomas | Thomas Olinger | Actor | 1934 | 1 | |
| Oikonomidis, Kostas | Kostas Oikonomidis | Actor | 1934 | 2 | |
| Oenslager, Donald | Donald Oenslager | Costume Designer, Designer, Lighting Designer | 1934 - 1951 | 19 | 1 |
| Otto, Teo | Teo Otto | Costume Designer, Designer, Director | 1934 - 1959 | 14 | |
| Ott, Rudolf | Rudolf Ott | Actor | 1935 | 1 | |
| Obonya, Hanns | Hanns Obonya | Actor | 1935 | 1 | |
| Obert, Gerti | Gerti Obert | Actor | 1935 | 1 | |
| Orly, Yvonne | Yvonne Orly | Actor | 1935 | 2 | |
| O'Brien, Raymond | Raymond O'Brien | Actor | 1935 - 1937 | 7 | |
| Olty, Magda | Magda Olty | Actor | 1935 - 1941 | 2 | |
| Omdal, Leif | Leif Omdal | Actor | 1935 - 1956 | 4 | |
| Olympios, Spyros | Spyros Olympios | Actor, Dancer | 1935 - 1997 | 10 | |
| Ohrenstein, Ota | Ota Ohrenstein | Actor | 1936 | 1 | |
| O'Flyn, Audrey | Audrey O'Flyn | Actor | 1936 | 2 | |
| Okada, Shu | Shu Okada | Actor | 1936 | 1 | |
| Olin, Brita | Brita Olin | Actor | 1936 | 1 | |
| Owen, Ruth, Wynn | Ruth Wynn Owen | Actor | 1936 | 1 | |
| O'Lochlinn, Sheila | Sheila O'Lochlinn | Actor | 1936 | 1 | |
| O'Neill, Denis | Denis O'Neill | Actor | 1936 | 1 | |
| O'Donnell, Seumas | Seumas O'Donnell | Actor | 1936 | 1 | |
| Olasz, Lajos | Lajos Olasz | Actor | 1936 | 1 | |
| Oswald, Axsel | Axsel Oswald | Actor | 1936 - 1937 | 2 | |
| Orbeck, Anders | Anders Orbeck | Translator | 1936 - 2018 | 3 | 1 |
| Orr, Lynn E. | Lynn E. Orr | Designer, Director, Lighting Designer | 1937 | 3 | |
| Oulianine, Nina | Nina Oulianine | Dancer | 1937 | 1 | |
| Olney, Joseph | Joseph Olney | Actor | 1938 | 1 | |
| Overlack, Olga | Olga Overlack | Actor | 1938 | 1 | |
| Oppel, Günther | Günther Oppel | Actor | 1938 | 1 | |
| Ornelli, Otto | Otto Ornelli | Choreographer | 1938 | 1 | |
| Olszewski, Reinhold | Reinhold Olszewski | Actor | 1938 | 1 | |
| Ording, Jørn | Jørn Ording | Actor, Director | 1938 - 1978 | 69 | 1 |
| O'Neil, Sally | Sally O'Neil | Actor | 1939 | 1 | |
| Osterwalder, Otto | Otto Osterwalder | Musician | 1939 | 1 | |
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