| Mole, Vojeslav | Vojeslav Mole (Vojeslav Mole) | Translator | 1920 - 1923 | 3 | |
| Majthényi, László | László Majthényi (László Majthényi) | Actor, Director | 1919 - 1921 | 3 | |
| Mowinckel, L. | L. Mowinckel (L. Mowinckel) | Musical Director | 1924 | 1 | |
| Messiter, Eric | Eric Messiter (Eric Messiter) | Actor | 1921 | 1 | |
| Myron, J. | J. Myron (J. Myron) | Director | 1921 | 1 | |
| McConnell, Frederic | Frederic McConnell (Frederic McConnell) | Director | 1922 - 1930 | 3 | |
| Merritt, George | George Merritt (George Merritt) | Actor | 1922 - 1925 | 4 | |
| Marvick, Laurentia | Laurentia Marvick (Laurentia Marvick) | Actor | 1922 | 1 | |
| Mickelson, Lawrence T. | Lawrence T. Mickelson (Lawrence T. Mickelson) | Actor | 1922 | 1 | |
| Mathre, Gerhard | Gerhard Mathre (Gerhard Mathre) | Actor | 1922 | 1 | |
| May, Elsbeth | Elsbeth May (Elsbeth May) | Actor | 1922 - 1990 | 3 | |
| Martelli, Arnaldo | Arnaldo Martelli (Arnaldo Martelli) | Actor | 1922 | 3 | |
| Murata, Kikuko | Kikuko Murata (Kikuko Murata) | Actor | 1922 | 1 | |
| Murata, Miyako | Miyako Murata (Miyako Murata) | Actor | 1922 | 1 | |
| Mumdzhiev, K. | K. Mumdzhiev (K. Mumdzhiev) | Actor | 1922 | 1 | |
| Masi, Rossana | Rossana Masi (Rossana Masi) | Actor | 1922 | 1 | |
| Martynov, V. | V. Martynov (V. Martynov) | Designer | 1923 | 1 | |
| Milev, Geo | Geo Milev (Geo Milev) | Translator | 1923 - 1924 | 4 | |
| McMahon, Glenn | Glenn McMahon (Glenn McMahon) | Actor | 1923 | 1 | |
| Metaxa, Antigoni | Antigoni Metaxa (Antigoni Metaxa) | Actor | 1923 | 1 | |
| Morino, Jone | Jone Morino (Jone Morino) | Actor | 1923 - 1929 | 5 | |
| Morino, Maria | Maria Morino (Maria Morino) | Actor | 1923 - 1924 | 2 | |
| Meussen, Gerard | Gerard Meussen (Gerard Meussen) | Actor | 1923 | 1 | |
| Mihalesco, M. | M. Mihalesco (M. Mihalesco) | Actor, Director | 1924 | 2 | |
| Mizoguchi, Saburo | Saburo Mizoguchi (Saburo Mizoguchi) | Designer | 1924 - 1928 | 2 | |
| Moore, Frank | Frank Moore (Frank Moore) | Actor | 1913 - 1928 | 4 | |
| Methling, Svend | Svend Methling (Svend Methling) | Actor, Adaptation, Designer, Director | 1921 - 1964 | 9 | |
| Madsen-Wiesneck, J. | J. Madsen-Wiesneck (J. Madsen-Wiesneck) | Designer | 1924 - 1934 | 2 | |
| Mathorne, C. | C. Mathorne (C. Mathorne) | Designer | 1924 | 1 | |
| Michelsen, Randi | Randi Michelsen (Randi Michelsen) | Actor | 1924 - 1960 | 4 | |
| Mjøen, Sonja | Sonja Mjøen (Sonja Mjøen) | Actor | 1924 | 1 | |
| Moseley, Kathleen | Kathleen Moseley (Kathleen Moseley) | Actor | 1924 - 1926 | 2 | |
| Makó, Aida | Aida Makó (Aida Makó) | Actor | 1924 | 1 | |
| Magnúsdóttir, Lara | Lara Magnúsdóttir (Lara Magnúsdóttir) | Actor | 1924 | 1 | |
| Mihalesco, Mr. | Mr. Mihalesco | Actor | 1925 - 1934 | 4 | |
| Malmquist, Sandro | Sandro Malmquist | Designer, Director, Translator | 1925 - 1961 | 90 | |
| Millander, Sven | Sven Millander | Actor | 1925 | 1 | |
| Milton, Ernest | Ernest Milton | Actor, Director | 1925 - 1930 | 8 | |
| Morley, Malcolm | Malcolm Morley | Actor, Designer, Director | 1925 - 1933 | 10 | |
| Medved, Cirila | Cirila Medved | Actor | 1925 | 1 | |
| Márkus, László | László Márkus | Designer, Director, Translator | 1925 - 1948 | 3 | |
| Mágori, Mária | Mária Mágori | Actor | 1924 - 1943 | 53 | |
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