| 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 | |
| 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 | |
| Merrall, Mary | Mary Merrall | Actor | 1918 - 1972 | 5 | |
| Müller, Rolf | Rolf Müller | Actor | 1918 - 1943 | 5 | |
| Mārsietis, Jānis | Jānis Mārsietis | Actor | 1918 - 1939 | 8 | |
| Mörike, Annemarie | Annemarie Mörike | Actor | 1918 - 1937 | 3 | |
| Mundet, Agustín | Agustín Mundet | Translator | 1918 - 1925 | 7 | |
| Menzel, Arthur | Arthur Menzel | Actor | 1918 - 1923 | 2 | |
| Merz, ? | ? Merz | Actor | 1918 - 1919 | 2 | |
| Molnár, Rózsi V. | Rózsi V. Molnár | Actor | 1918 | 1 | |
| Melcher, Otto | Otto Melcher | Actor | 1918 | 1 | |
| Michl, Frieda | Frieda Michl | Actor | 1918 | 1 | |
| Maack, Frk. | Frk. Maack | Actor | 1918 | 5 | |
| Maack, Mr. | Mr. Maack | Actor | 1918 | 1 | |
| Maack, Fr. | Fr. Maack | Actor | 1918 | 1 | |
| Maukwitz, Otto | Otto Maukwitz | Actor | 1918 | 1 | |
| Müller, Condi | Condi Müller | Actor | 1918 | 1 | |
| Mroczkowski, (?) | (?) Mroczkowski | Actor | 1918 | 1 | |
| Mirecka, E. | E. Mirecka | Actor | 1918 | 1 | |
| Mac, Nila | Nila Mac | Actor | 1918 | 1 | |
| Murata, Minoru | Minoru Murata | Actor | 1918 | 1 | |
| Moraïtis, Nikos | Nikos Moraïtis | Actor | 1918 | 1 | |
| 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 | |
| Mendelevic, I. | I. Mendelevic | Designer | 1918 | 1 | |
| Mechi-Gracci, Emilia | Emilia Mechi-Gracci | Actor | 1918 | 1 | |
| Moltini, Cesare | Cesare Moltini | Actor | 1918 | 1 | |
| Malberg, Henrik | Henrik Malberg | Actor | 1917 - 1948 | 4 | |
| Martens, Ernst | Ernst Martens | Actor | 1917 - 1938 | 4 | 1 |
| Martínez Sierra, María | María Martínez Sierra | Adaptation, Translator | 1917 - 1930 | 22 | 1 |
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