| Marchetti, I. | I. Marchetti | Actor | 1903 | 1 | |
| Marchetti, F. | F. Marchetti | Actor | 1903 | 1 | |
| Müller, Else | Else Müller | Actor | 1903 | 1 | |
| McDonald, Flora | Flora McDonald | Actor | 1903 | 1 | |
| Malburg, Philipp | Philipp Malburg | Actor | 1903 | 1 | |
| Momuleanu, Eufrosina | Eufrosina Momuleanu | Actor | 1903 | 1 | |
| Mavrodi, Alexandru | Alexandru Mavrodi | Actor | 1903 | 1 | |
| Martyn, Edward | Edward Martyn | Director | 1903 - 1904 | 2 | 1 |
| Moore, George | George Moore | Director | 1903 - 1904 | 2 | 1 |
| Moragas, Miquel | Miquel Moragas | Set Designer | 1903 - 1906 | 2 | |
| Mack, William B. | William B. Mack | Actor | 1903 - 1907 | 8 | 1 |
| Mosnier, Charles | Charles Mosnier | Actor | 1903 - 1907 | 3 | |
| Mazzini, Annunziata | Annunziata Mazzini | Actor | 1903 - 1908 | 21 | |
| Mauth, Karl | Karl Mauth | Actor, Director | 1903 - 1917 | 6 | |
| 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 | Actor | 1903 - 1938 | 3 | |
| Malých, Mrs. | Mrs. Malých | Actor | 1904 | 1 | |
| Mayer, Dorothy Virginia | Dorothy Virginia Mayer | Actor | 1904 | 1 | |
| Martin, Frida | Frida Martin | Actor | 1904 | 1 | |
| Mertens, Tea | Tea Mertens | Actor | 1904 | 1 | |
| Magregor, Norval | Norval Magregor | Actor | 1904 | 2 | |
| Morris, William | William Morris | Actor | 1904 | 1 | 1 |
| Majdrowiczowa, Sylwestra | Sylwestra Majdrowiczowa | Actor | 1904 | 1 | |
| Martin, Hilda | Hilda Martin | Actor | 1904 | 1 | |
| McGilvray, Laura | Laura McGilvray | Actor | 1904 | 1 | 1 |
| Mason, John | John Mason | Actor | 1904 | 1 | 1 |
| Massen, Louis | Louis Massen | Actor | 1904 | 1 | 1 |
| Millward, Charles | Charles Millward | Actor | 1904 | 1 | 1 |
| MacVicars, Mr. | Mr. MacVicars | Actor | 1904 - 1905 | 2 | |
| Murby, Millicent | Millicent Murby | Actor | 1904 - 1905 | 2 | |
| Mehring, Oscar | Oscar Mehring | Actor | 1904 - 1907 | 4 | |
| Mitschkowski, Arthur | Arthur Mitschkowski | Actor | 1904 - 1910 | 4 | |
| Moebius, Eugen | Eugen Moebius | Actor, Director | 1904 - 1911 | 5 | |
| Mestayer, Harry | Harry Mestayer | Actor, Director | 1904 - 1918 | 31 | |
| Miethke, Otto | Otto Miethke | Actor | 1904 - 1928 | 15 | |
| Marr, Hans | Hans Marr | Actor, Director | 1904 - 1938 | 101 | |
| Malinowska, Czesława | Czesława Malinowska | Actor | 1905 | 2 | |
| Matthes, Oskar | Oskar Matthes | Actor | 1905 | 1 | |
| Meisel, Clara | Clara Meisel | Actor | 1905 | 1 | |
| Manny, Henriette | Henriette Manny | Actor | 1905 | 1 | |
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