| MacVicars, Mr. | Mr. MacVicars (Mr. MacVicars) | Actor | 1904 - 1905 | 2 | |
| 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 | |
| Montgomerie, Astolaine | Astolaine Montgomerie (Astolaine Montgomerie) | Actor | 1905 | 1 | |
| McKee, William | William McKee (William McKee) | Actor | 1905 | 1 | |
| Meysel, Adele | Adele Meysel (Adele Meysel) | Actor | 1905 | 2 | |
| Mendel, H. | H. Mendel (H. Mendel) | Actor | 1905 | 2 | |
| Mariewska, Zofia | Zofia Mariewska (Zofia Mariewska) | Actor | 1905 | 1 | |
| Mariański, Marian | Marian Mariański (Marian Mariański) | Actor | 1905 - 1912 | 2 | |
| Myin, - | - Myin (- Myin) | Actor | 1905 | 1 | |
| Meunier, Maurice | Maurice Meunier (Maurice Meunier) | Actor | 1905 - 1914 | 2 | |
| MacClellan, Ellis | Ellis MacClellan (Ellis MacClellan) | Actor | 1905 | 1 | |
| Meech, Owen | Owen Meech (Owen Meech) | Actor | 1905 - 1910 | 4 | |
| Minto, Dorothy | Dorothy Minto (Dorothy Minto) | Actor | 1905 | 1 | |
| Moor, Karel | Karel Moor (Karel Moor) | Adaptation, Composer | 1905 | 2 | |
| MacGregor, Mr. | Mr. MacGregor (Mr. MacGregor) | Actor | 1905 | 1 | |
| Murby, Millicent | Millicent Murby (Millicent Murby) | Actor | 1904 - 1905 | 2 | |
| Mitchelmore, Daisy | Daisy Mitchelmore (Daisy Mitchelmore) | Actor | 1905 | 1 | |
| Massin, - | - Massin (- Massin) | Actor | 1906 | 2 | |
| Mirskaya, - | - Mirskaya (- Mirskaya) | Actor | 1906 | 2 | |
| Moret, Henriette | Henriette Moret (Henriette Moret) | Actor | 1906 - 1911 | 10 | |
| Møller, Julie | Julie Møller (Julie Møller) | Actor | 1906 | 1 | |
| Marot, - | - Marot (- Marot) | Actor | 1906 | 1 | |
| Marjeroni, George | George Marjeroni (George Marjeroni) | Actor | 1906 | 2 | |
| Michnowska, Stefania | Stefania Michnowska (Stefania Michnowska) | Actor | 1906 - 1924 | 13 | |
| Moustakas, Konstantinos | Konstantinos Moustakas (Konstantinos Moustakas) | Actor | 1906 - 1909 | 4 | |
| Mason, William C. | William C. Mason (William C. Mason) | Actor | 1906 - 1926 | 5 | |
| Moser, Emil | Emil Moser (Emil Moser) | Actor | 1906 - 1916 | 6 | |
| Magnus, Cecil | Cecil Magnus (Cecil Magnus) | Actor | 1906 - 1907 | 6 | |
| MacDermott, Marc | Marc MacDermott (Marc MacDermott) | Actor | 1906 - 1907 | 12 | |
| Mendelssohn, Gordon | Gordon Mendelssohn (Gordon Mendelssohn) | Actor | 1906 - 1907 | 6 | |
| MacDonald, George | George MacDonald (George MacDonald) | Actor | 1906 - 1907 | 4 | |
| Munt, E. M. | E. M. Munt (E. M. Munt) | Actor | 1906 | 1 | |
| Młodowska, (?) | (?) Młodowska ((?) Młodowska) | Actor | 1906 | 1 | |
| Mastalski, Zenon | Zenon Mastalski (Zenon Mastalski) | Actor | 1907 - 1912 | 4 | |
| McGuire, John | John McGuire (John McGuire) | Actor | 1907 | 1 | |
| MacLarnie, Thomas | Thomas MacLarnie (Thomas MacLarnie) | Actor | 1907 | 1 | |
| Mowinckel-Nilsen, Aug. | August Mowinckel-Nilsen (Aug. Mowinckel-Nilsen) | Actor | 1907 - 1928 | 5 | |
| Measor, Adela | Adela Measor (Adela Measor) | Actor | 1907 | 1 | |
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