| Martyn, Edward | Edward Martyn (Edward Martyn) | Director | 1903 - 1904 | 2 | |
| Moore, George | George Moore (George Moore) | Director | 1903 - 1904 | 2 | |
| Moragas, Miquel | Miquel Moragas | Set Designer | 1903 - 1906 | 2 | |
| Mack, William B. | William B. Mack (William B. Mack) | Actor | 1903 - 1907 | 8 | |
| Mosnier, Charles | Charles Mosnier | Actor | 1903 - 1907 | 3 | |
| Mazzini, Annunziata | Annunziata Mazzini (Annunziata Mazzini) | Actor | 1903 - 1908 | 21 | |
| Mauth, Karl | Karl Mauth (Karl Mauth) | Actor, Director | 1903 - 1917 | 6 | |
| Müller, - | - Müller (- Müller) | Actor | 1903 - 1918 | 4 | |
| Matejić, Milan | Milan Matejić | Actor | 1903 - 1918 | 3 | |
| Martinelli, Anna | Anna Martinelli | Actor | 1903 - 1920 | 2 | |
| Mijatev, Georgi | Georgi Mijatev (Georgi Mijatev) | Actor | 1903 - 1938 | 3 | |
| Malých, Mrs. | Mrs. Malých (Mrs. Malých) | Actor | 1904 | 1 | |
| Mayer, Dorothy Virginia | Dorothy Virginia Mayer (Dorothy Virginia Mayer) | Actor | 1904 | 1 | |
| Martin, Frida | Frida Martin (Frida Martin) | Actor | 1904 | 1 | |
| Mertens, Tea | Tea Mertens (Tea Mertens) | Actor | 1904 | 1 | |
| Magregor, Norval | Norval Magregor (Norval Magregor) | Actor | 1904 | 2 | |
| Morris, William | William Morris (William Morris) | Actor | 1904 | 1 | |
| Majdrowiczowa, Sylwestra | Sylwestra Majdrowiczowa (Sylwestra Majdrowiczowa) | Actor | 1904 | 1 | |
| Martin, Hilda | Hilda Martin (Hilda Martin) | Actor | 1904 | 1 | |
| McGilvray, Laura | Laura McGilvray (Laura McGilvray) | Actor | 1904 | 1 | |
| Mason, John | John Mason (John Mason) | Actor | 1904 | 1 | |
| Massen, Louis | Louis Massen (Louis Massen) | Actor | 1904 | 1 | |
| Millward, Charles | Charles Millward (Charles Millward) | Actor | 1904 | 1 | |
| MacVicars, Mr. | Mr. MacVicars (Mr. MacVicars) | Actor | 1904 - 1905 | 2 | |
| Murby, Millicent | Millicent Murby (Millicent Murby) | Actor | 1904 - 1905 | 2 | |
| Mehring, Oscar | Oscar Mehring | Actor | 1904 - 1907 | 4 | |
| Mitschkowski, Arthur | Arthur Mitschkowski (Arthur Mitschkowski) | Actor | 1904 - 1910 | 4 | |
| Moebius, Eugen | Eugen Moebius (Eugen Moebius) | Actor, Director | 1904 - 1911 | 5 | |
| Mestayer, Harry | Harry Mestayer (Harry Mestayer) | Actor, Director | 1904 - 1918 | 31 | |
| Miethke, Otto | Otto Miethke (Otto Miethke) | Actor | 1904 - 1928 | 15 | |
| Marr, Hans | Hans Marr (Hans Marr) | Actor, Director | 1904 - 1938 | 101 | |
| Malinowska, Czesława | Czesława Malinowska (Czesława Malinowska) | Actor | 1905 | 2 | |
| Matthes, Oskar | Oskar Matthes (Oskar Matthes) | Actor | 1905 | 1 | |
| Meisel, Clara | Clara Meisel (Clara Meisel) | Actor | 1905 | 1 | |
| Manny, Henriette | Henriette Manny (Henriette Manny) | Actor | 1905 | 1 | |
| Meinhardt, Felix | Felix Meinhardt (Felix Meinhardt) | Actor | 1905 | 2 | |
| Menner, Otto | Otto Menner (Otto Menner) | Actor | 1905 | 2 | |
| Martersteig, Eva | Eva Martersteig (Eva Martersteig) | Actor | 1905 | 1 | |
| Madesky, Herbert | Herbert Madesky (Herbert Madesky) | Actor | 1905 | 1 | |
| Marr, Anna | Anna Marr (Anna Marr) | Actor | 1905 | 1 | |
| Montgomerie, Astolaine | Astolaine Montgomerie (Astolaine Montgomerie) | Actor | 1905 | 1 | |
| McKee, William | William McKee (William McKee) | Actor | 1905 | 1 | |
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