| Matsumoto, Kappei | Kappei Matsumoto | Actor | 1934 - 1978 | 2 | |
| Matsuyama, Utako | Utako Matsuyama | Actor | 1914 | 1 | |
| Matthias, Peter | Peter Matthias | Actor | 1975 - 1992 | 2 | |
| Matveeva, Svetlana | Svetlana Matveeva | Actor, Costume Designer, Designer | 2001 | 3 | |
| Mátyás, Jolán | Jolán Mátyás | Actor | 1965 - 1969 | 2 | |
| Matz, Katharina | Katharina Matz | Actor | 1956 - 1985 | 3 | |
| Matzen, Volkert | Volkert Matzen | Actor | 1985 - 1997 | 4 | |
| Matzkanin, Mark | Mark Matzkanin | Lighting Designer | 1990 - 2007 | 2 | |
| Maud, Jane | Jane Maud | Actor | 1994 | 1 | |
| Maué, Cornelia | Cornelia Maué | Actor | 1977 | 1 | |
| Maughan, Sharon | Sharon Maughan | Actor | 1994 | 1 | |
| Mavromataki, Kelly | Kelly Mavromataki | Costume Designer | 2006 | 3 | |
| Maxwell, Steve | Steve Maxwell | Actor | 1966 | 1 | |
| May, David | David May | Actor | 1981 | 1 | |
| May, Eberhard | Eberhard May | Actor | 1975 - 1997 | 2 | |
| May, Gisela | Gisela May | Actor | 1956 | 1 | |
| Mayer, Agda | Agda Mayer | Actor | 1878 - 1887 | 4 | |
| Mayer, Eva | Eva Mayer | Actor | 1969 | 1 | |
| Mayers, Lucianna | Lucianna Mayers | Actor | 2006 | 1 | |
| Mazzocchetti, Germano | Germano Mazzocchetti | Composer | 1993 - 2019 | 42 | |
| Mbugua, Ian | Ian Mbugua | Director | 2006 | 1 | |
| McAleer, Lucy | Lucy McAleer | Actor | 1953 | 1 | |
| McAllister, Peter | Peter McAllister | Director | 2004 | 5 | |
| McAnally, Ray | Ray McAnally | Actor | 1982 | 1 | |
| McArthur, Molly | Molly McArthur | Actor, Costume Designer, Designer | 1925 - 1946 | 6 | |
| McArthur, Murray | Murray McArthur | Actor | 1996 - 1998 | 6 | |
| McCall, Kathleen | Kathleen McCall | Actor | 2002 | 1 | |
| McCallum, Paul | Paul McCallum | Actor | 1970 | 3 | |
| McCarthy, Claire-Elizabeth | Claire-Elizabeth McCarthy | Actor | 2002 | 1 | |
| McCarthy, Helena | Helena McCarthy | Actor | 1994 | 6 | |
| McCarthy, Sean | Sean McCarthy | Translator | 1982 | 1 | |
| McClure, Keven | Keven McClure | Actor | 1944 - 1945 | 4 | |
| McClure, Laura | Laura McClure | Actor | 1936 | 1 | |
| McCord, Catherine | Catherine McCord | Actor | 1935 | 1 | |
| McCord, Michael | Michael McCord | Designer | 2000 | 1 | |
| McCourt, Margareth | Margareth McCourt | Actor | 1953 | 1 | |
| McCoy, Michael | Michael McCoy | Sound Designer | 1992 | 3 | |
| McCracken, Everett | Everett McCracken | Composer | 1928 | 2 | |
| McCurty, Patricia | Patricia McCurty | Actor | 2003 | 1 | |
| McDonnell, Owen | Owen McDonnell | Actor | 2005 | 1 | |
| McElhinney, Ian | Ian McElhinney | Actor | 1993 | 1 | |
| McElroy, Steve | Steve McElroy | Actor | 2003 | 1 | |
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