| Oehler, Hans | Hans Oehler (Hans Oehler) | Actor | 1919 | 1 | |
| Ott, Magdalena | Magdalena Ott (Magdalena Ott) | Actor | 1919 | 2 | |
| Ortega, - | - Ortega | Actor | 1919 | 1 | |
| Olin, Anna | Anna Olin (Anna Olin) | Actor | 1919 | 1 | |
| Olsson, Frk. | Frk. Olsson | Actor | 1919 | 1 | |
| Oppermann, Leonore | Leonore Oppermann (Leonore Oppermann) | Actor | 1919 - 1922 | 3 | |
| Osten, Käte | Käte Osten (Käte Osten) | Actor | 1919 - 1923 | 3 | |
| Odstrčilová, Liběna | Liběna Odstrčilová (Liběna Odstrčilová) | Actor | 1919 - 1932 | 6 | |
| Ottzenn, Paula | Paula Ottzenn (Paula Ottzenn) | Actor | 1919 - 1936 | 10 | |
| Otto, Alexander | Alexander Otto (Alexander Otto) | Actor, Designer | 1919 - 1966 | 7 | |
| Otto-Osmarr, Lili | Lili Otto-Osmarr (Lili Otto-Osmarr) | Actor | 1920 | 2 | |
| Olander, Sigfrid | Sigfrid Olander (Sigfrid Olander) | Actor | 1920 | 1 | |
| Ouředník, František | František Ouředník | Actor | 1920 | 1 | |
| Otto, Erich | Erich Otto (Erich Otto) | Actor | 1920 - 1921 | 2 | |
| Otto-Morgenstern, Martina | Martina Otto-Morgenstern (Martina Otto-Morgenstern) | Actor | 1920 - 1921 | 2 | |
| Orendy, C. | C. Orendy | Actor | 1920 - 1928 | 3 | |
| Oehlschläger, Margarethe | Margarethe Oehlschläger (Margarethe Oehlschläger) | Choreographer | 1921 | 1 | |
| Ozols-Heins, Jānis | Jānis Ozols-Heins | Actor | 1921 | 1 | |
| Orlandini, Lia | Lia Orlandini (Lia Orlandini) | Actor | 1921 - 1922 | 5 | |
| Olsen, Hanns | Hanns Olsen (Hanns Olsen) | Actor | 1921 - 1931 | 4 | |
| Osis, Jānis | Jānis Osis | Actor, Director | 1921 - 1943 | 5 | |
| Otáhalová, Lída | Lída Otáhalová (Lída Otáhalová) | Actor | 1922 | 1 | |
| Olson, Jonas | Jonas Olson (Jonas Olson) | Actor | 1922 | 1 | |
| O'Dwyer, Katherine | Katherine O'Dwyer | Actor | 1922 | 1 | |
| Oliver, Elinor | Elinor Oliver | Actor | 1922 | 1 | |
| Okamura, Fumio | Fumio Okamura | Actor | 1923 | 1 | |
| Orliński, Bolesław | Bolesław Orliński | Actor | 1923 | 1 | |
| O`Brien-Moore, Erin | Erin O'Brien-Moore | Actor | 1923 - 1956 | 4 | |
| Opøien, Lydia | Lydia Opøien (Lydia Opøien) | Actor | 1923 - 2006 | 13 | |
| Ono, Miyakichi | Miyakichi Ono | Actor | 1925 | 1 | |
| Oakeshott, W., F. | W. F. Oakeshott | Actor | 1925 | 1 | |
| Oldland, Lilian | Lilian Oldland | Actor | 1925 | 1 | |
| Otis, Charles | Charles Otis | Actor | 1925 | 1 | |
| Olska, Maria | Maria Olska | Actor | 1925 | 1 | |
| Ozory, Armand | Armand Ozory (Armand Ozory) | Actor | 1925 - 1952 | 8 | |
| Olden, Melanie | Melanie Olden (Melanie Olden) | Actor | 1926 | 1 | |
| Osipovič, Jakov | Jakov Osipovič | Actor | 1926 | 1 | |
| Orlamundt, Kai | Kai Orlamundt | Actor | 1926 | 1 | |
| Osborne, Eunice | Eunice Osborne | Actor | 1926 | 1 | |
| Owen, Reginald | Reginald Owen | Actor | 1926 - 1932 | 2 | |
| Osmund, Alfred | Alfred Osmund | Actor | 1926 - 1933 | 3 | |
| Owen, Hugh | Hugh Owen (Hugh Owen) | Designer | 1927 | 1 | |
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