| Mangan, Conal | Conal Mangan | Actor | 1918 | 1 | |
| MacDonagh, John | John MacDonagh | Actor | 1918 | 1 | |
| Massingham, Dorothy | Dorothy Massingham | Actor | 1918 | 1 | |
| Maigne, Charles | Charles Maigne | Adaptation | 1918 | 1 | |
| Maihoff, Lotte | Lotte Maihoff | Actor | 1918 | 1 | |
| Merz, ?, | ? Merz | Actor | 1918 - 1920 | 2 | |
| Müller, Rolf, | Rolf Müller | Actor | 1918 - 1944 | 5 | |
| Mari, Febo | Febo Mari | Actor, Director | 1919 | 2 | |
| Mordeglia, Nietta | Nietta Mordeglia | Actor | 1919 | 1 | |
| Manhart, T., | T. Manhart | Actor | 1919 | 1 | |
| Mandler, Gertrud, | Gertrud Mandler | Actor | 1919 | 1 | |
| Mullo, -, | - Mullo | Actor | 1919 | 1 | |
| Melvyl, -, | - Melvyl | Actor | 1919 | 1 | |
| Majthényi, László, | László Majthényi | Actor, Director | 1919 | 3 | |
| Mihályi, Ernő | Ernő Mihályi | Actor | 1919 | 2 | |
| Meißner, Friederike | Friederike Meißner | Actor | 1919 | 3 | |
| Mathaus, Willi | Willi Mathaus | Actor | 1919 | 1 | |
| Meißner, Lilli | Lilli Meißner | Actor | 1919 | 1 | |
| Mayer, Karl | Karl Mayer | Conductor | 1919 | 1 | |
| Merten, Bernh. | Bernh. Merten | Conductor | 1919 | 1 | |
| Meißner, Hoffkapellmester | Hoffkapellmester Meißner | Conductor | 1919 | 1 | |
| Maltana-Scharschmidt, Else, | Else Maltana-Scharschmidt | Actor | 1919 - 1920 | 5 | |
| Möbius, Paula, | Paula Möbius | Actor | 1919 - 1922 | 3 | |
| Morţun, Ion | Ion Morţun | Actor | 1919 - 1928 | 5 | |
| Mennenga, Jan, | Jan Mennenga | Actor | 1919 - 1938 | 3 | |
| Minichini, I., | I. Minichini | Actor | 1920 | 1 | |
| Minichini, S., | S. Minichini | Actor | 1920 | 1 | |
| Minichini, M., | M. Minichini | Actor | 1920 | 1 | |
| May, Gustav, | Gustav May | Actor | 1920 | 1 | |
| Maschke, Gretel, | Gretel Maschke | Actor | 1920 | 1 | |
| Metge, Leni, | Leni Metge | Actor | 1920 | 1 | |
| Martini, Mortimer, | Mortimer Martini | Actor | 1920 | 4 | |
| Molnár, József, | József Molnár | Actor | 1920 | 2 | |
| Miliander, Sven, | Sven Miliander | Actor | 1920 | 6 | |
| Martin, Knut, | Knut Martin | Actor | 1920 | 1 | |
| Mycot, -, | - Mycot | Actor | 1920 | 1 | |
| Mole, Vojeslav, | Vojeslav Mole | Translator | 1920 | 3 | |
| Martinec, Miloš | Miloš Martinec | Actor | 1920 | 1 | |
| Mansfeld, František (Otto) | František (Otto) Mansfeld | Actor | 1920 | 1 | |
| Morris, Leland, C. | Leland C. Morris | Actor | 1920 | 1 | |
| Molnár, János | János Molnár | Actor | 1920 | 3 | |
| Münch, Josef | Josef Münch | Director | 1920 | 1 | |
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