| Moyer, Pauline | Pauline Moyer | Actor | 1913 | 1 | |
| Marshall, Edward, Lester | Edward Lester Marshall | Actor | 1913 | 1 | |
| Maulsby, Francis, A. | Francis A. Maulsby | Actor | 1913 | 1 | |
| Madgewick, - | - Madgewick | Actor | 1913 | 1 | |
| Moore, - | - Moore | Actor | 1913 | 1 | |
| Mészáros, Lajos | Lajos Mészáros | Actor | 1914 - 1922 | 2 | |
| Molnár, László | László Molnár | Actor | 1914 - 1917 | 2 | |
| Mészáros, Sándor | Sándor Mészáros | Actor | 1914 | 1 | |
| Mills, Harold | Harold Mills | Conductor, Musical Director | 1914 - 1921 | 2 | |
| Mierkalns, Fricis | Fricis Mierkalns | Translator | 1914 | 1 | |
| Marx, Felix | Felix Marx | Actor | 1917 | 1 | |
| Manthey, Curt | Curt Manthey | Actor | 1917 | 1 | |
| Muehlhan, Wilhelm | Wilhelm Muehlhan | Actor | 1917 | 1 | |
| Markeng, Johannes | Johannes Markeng | Costume Designer | 1981 | 4 | |
| Müller, Heinz | Heinz Müller | Actor | 1981 - 2005 | 9 | |
| Moe, Todd | Todd Moe | Actor | 1981 | 1 | |
| Morris, Gwladys | Gwladys Morris | Actor | 1917 | 1 | |
| Miller, Beatrice | Beatrice Miller | Actor | 1917 | 1 | |
| Matthews, Cameron | Cameron Matthews | Actor | 1917 | 1 | |
| MacCormack, Katherine | Katherine MacCormack | Actor | 1917 - 1918 | 2 | |
| Mangan, Conal | Conal Mangan | Actor | 1918 | 1 | |
| MacDonagh, Joseph | Joseph MacDonagh | Actor | 1917 | 1 | |
| MacDonagh, John | John MacDonagh | Actor | 1918 | 1 | |
| Mac an Bhaird, Art | Art Mac an Bhaird | Actor | 1917 | 1 | |
| Mazurkiewicz, Tadeusz | Tadeusz Mazurkiewicz | Conductor | 1917 | 1 | |
| Mahr, Alfred | Alfred Mahr | Actor | 1911 - 1917 | 2 | |
| Massingham, Dorothy | Dorothy Massingham | Actor | 1918 | 1 | |
| Mihályi, Ernő | Ernő Mihályi | Actor | 1919 - 1944 | 2 | |
| 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 | |
| Maybury, Edgar | Edgar Maybury | Designer | 1921 | 1 | |
| McCreery, Helen | Helen McCreery | Actor | 1921 | 1 | |
| Manners, T., P. | T. P. Manners | Actor | 1921 | 1 | |
| Mača, Alma | Alma Mača | Actor | 1921 | 1 | |
| Muncis, Jānis | Jānis Muncis | Designer | 1921 | 1 | |
| Mačs, Emils | Emils Mačs | Actor | 1921 | 3 | |
| Marseets, Jānis | Jānis Marseets | Actor | 1921 | 5 | |
| Mitrevics, Augusts | Augusts Mitrevics | Actor | 1921 | 2 | |
| Meads, Ernest | Ernest Meads | Actor | 1922 | 1 | |
| Martineau, Guy | Guy Martineau | Actor | 1922 - 1931 | 2 | |
| Mangström, Anna | Anna Mangström | Actor | 1922 | 1 | |
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