| Mariani, Mario | Mario Mariani | Actor | 1954 - 1963 | 2 | |
| Martin, Harald | Harald Martin | Designer | 1954 - 1973 | 8 | 1 |
| Medina, Estela | Estela Medina | Actor | 1954 - 1979 | 3 | |
| Muszyński, Antoni | Antoni Muszyński | Designer | 1955 | 1 | |
| Müllerová, M. | M. Müllerová | Actor | 1955 | 1 | |
| Markovičová, M. | M. Markovičová | Actor | 1955 | 1 | 1 |
| Matĕjová, Libuše | Libuše Matĕjová | Actor | 1955 | 1 | |
| Manu, George | George Manu | Actor | 1955 | 1 | |
| Molin, Ica | Ica Molin | Actor | 1955 | 1 | |
| Matei, Gelu | Gelu Matei | Choreographer | 1955 | 1 | |
| Mētra, Jānis | Jānis Mētra | Actor | 1955 | 1 | |
| Magnus, Dorothy, B. | Dorothy B. Magnus | Director | 1955 | 1 | |
| Macdonald, Murray | Murray Macdonald | Director | 1955 | 1 | 1 |
| Matić, Vladislav | Vladislav Matić | Actor | 1955 | 1 | |
| Mirkin, Ja. | Ja. Mirkin | Director | 1955 | 1 | |
| Monaci, Aldo | Aldo Monaci | Actor | 1955 - 1956 | 4 | |
| Monaci, Berto | Berto Monaci | Actor | 1955 - 1956 | 4 | |
| Monaci, Maria Grazia | Maria Grazia Monaci | Actor | 1955 - 1956 | 4 | |
| Matĕjovský, Jan | Jan Matĕjovský | Director | 1955 - 1958 | 2 | 1 |
| Magnusson, Georg | Georg Magnusson | Designer | 1955 - 1958 | 2 | |
| McCallum, Neil | Neil McCallum | Actor | 1955 - 1958 | 2 | |
| Moore, Mavor | Mavor Moore | Actor | 1955 - 1960 | 3 | |
| Manni, Tarmo | Tarmo Manni | Actor | 1955 - 1973 | 3 | |
| Meunier, Enny | Enny Meunier | Actor | 1955 - 1977 | 3 | |
| Manning, Helen | Helen Manning | Actor | 1955 - 1997 | 5 | |
| Macpherson, William | William Macpherson | Designer | 1956 | 1 | |
| Malmström, Ulla | Ulla Malmström | Actor | 1956 | 1 | |
| May, Gisela | Gisela May | Actor | 1956 | 1 | |
| Merino, Juana | Juana Merino | Costume Designer | 1956 | 1 | |
| Motley, Robert | Robert Motley | Designer | 1956 | 1 | |
| Macháček, Frantisek | Frantisek Macháček | Actor | 1956 | 1 | |
| McMahon, James B. | James B. McMahon | Actor | 1956 | 1 | |
| Manon, Violeta | Violeta Manon | Actor | 1956 | 1 | |
| Mirski, Krastjo | Krastjo Mirski | Director, Translator | 1956 | 2 | |
| Mandil, Milka | Milka Mandil | Actor | 1956 | 1 | |
| Mussina, Nadezhda | Nadezhda Mussina | Actor | 1956 | 1 | |
| Martin, Walter | Walter Martin | Actor | 1956 | 1 | |
| Molitor, Marion | Marion Molitor | Actor | 1956 | 1 | |
| McCloskey, Michael | Michael McCloskey | Lighting Designer | 1956 | 1 | |
| Malone, Anne | Anne Malone | Actor | 1956 | 1 | |
| Marlowe, Margaret | Margaret Marlowe | Actor | 1956 | 1 | |
| Mahnke, Fritz | Fritz Mahnke | Designer | 1956 | 1 | |
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