| Olsson, Frk. | Frk. Olsson | Actor | 1919 | 1 | |
| Oppermann, Leonore | Leonore Oppermann | Actor | 1919 - 1922 | 3 | |
| Osten, Käte | Käte Osten | Actor | 1919 - 1923 | 3 | |
| Odstrčilová, Liběna | Liběna Odstrčilová | Actor | 1919 - 1932 | 6 | |
| Ottzenn, Paula | Paula Ottzenn | Actor | 1919 - 1936 | 10 | 1 |
| Otto, Alexander | Alexander Otto | Actor, Designer | 1919 - 1966 | 7 | |
| Otto-Osmarr, Lili | Lili Otto-Osmarr | Actor | 1920 | 2 | |
| Olander, Sigfrid | Sigfrid Olander | Actor | 1920 | 1 | 1 |
| Ouředník, František | František Ouředník | Actor | 1920 | 1 | |
| Otto, Erich | Erich Otto | Actor | 1920 - 1921 | 2 | |
| Otto-Morgenstern, Martina | Martina Otto-Morgenstern | Actor | 1920 - 1921 | 2 | |
| Orendy, C. | C. Orendy | Actor | 1920 - 1928 | 3 | |
| Oehlschläger, Margarethe | Margarethe Oehlschläger | Choreographer | 1921 | 1 | |
| Ozols-Heins, Jānis | Jānis Ozols-Heins | Actor | 1921 | 1 | |
| Orlandini, Lia | Lia Orlandini | Actor | 1921 - 1922 | 5 | |
| Olsen, Hanns | Hanns Olsen | Actor | 1921 - 1931 | 4 | |
| Osis, Jānis | Jānis Osis | Actor, Director | 1921 - 1943 | 5 | |
| Otáhalová, Lída | Lída Otáhalová | Actor | 1922 | 1 | |
| Olson, Jonas | 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 | Actor | 1923 - 2006 | 13 | 1 |
| 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 | Actor | 1925 - 1952 | 8 | |
| Olden, Melanie | 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 | Designer | 1927 | 1 | |
| Olsen, Moroni | Moroni Olsen | Actor | 1927 | 1 | |
| Olson, Selmer | Selmer Olson | Actor | 1927 | 1 | |
| Offerman, Jr., George | George Offerman, Jr. | Actor | 1927 | 1 | |
| Ockel, Reinhold | Reinhold Ockel | Designer, Director | 1927 - 1942 | 2 | |
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