7,133 people with a page here, the busiest first, counted by the productions and shows we hold for each. Another 24,181 people are named in cast lists and have no page yet.
| Maryellen Scilla Actor | 2 productions |
| Marylouise Burke Actor | 2 productions |
| Mateo Melendez Actor | 2 productions |
| Matt Briggs Actor | 2 productions |
| Matt Landers Actor | 2 productions |
| Matthew James Thomas Actor | 2 productions |
| Maureen Brennan Composer | 2 productions |
| Maurice Valency Lyricist | 2 shows |
| Mauricio Mendoza Actor | 2 productions |
| Max Casella Actor | 2 productions |
| Max Figman Actor, Director | 2 productions |
| Max Hoffman Jr. Actor | 2 productions |
| Maxwell Anderson Book Writer, Lyricist | 2 shows |
| Maxwell Glanville Actor | 2 productions |
| Maya Bowles Actor | 2 productions |
| Meg Mundy Actor | 2 productions |
| Megan Hilty Actor | 2 productions |
| Mel Marvin Composer | 2 shows |
| Melissa Van Der Schyff Actor | 2 productions |
| Melora Hardin Actor | 2 productions |
| Melville Stewart Actor | 2 productions |
| Mercedes Ellington Actor | 2 productions |
| Micaela Diamond Actor | 2 productions |
| Michael Ball Actor | 2 productions |
| Michael Bartlett Actor | 2 productions |
| Michael Bennett Book Writer, Choreographer, Director | 2 productions |
| Michael Blakemore Director | 2 shows |
| Michael Crawford Actor | 2 productions |
| Michael Fesco Actor | 2 productions |
| Michael Gibson Orchestrator | 2 shows |
| Michael Hayden Actor | 2 productions |
| Michael Herwitz Director | 2 productions |
| Michael Ingram Actor | 2 productions |
| Michael Kanin Book Writer | 2 shows |
| Michael Lanning Actor | 2 productions |
| Michael McCorry Rose Actor | 2 productions |
| Michael Nouri Actor | 2 productions |
| Michael Olaribigbe Actor | 2 productions |
| Michael Stuhlbarg Actor | 2 productions |
| Michel Fokine Choreographer | 2 shows |
| Michele Mais Actor | 2 productions |
| Mickey Rooney Actor | 2 productions |
| Micki Grant Actor, Book Writer, Composer, Lyricist | 2 shows |
| Mike Baerga Actor | 2 productions |
| Mike Faist Actor | 2 productions |
| Mike Kellin Actor | 2 productions |
| Milo O'Shea Actor | 2 productions |
| Milton Lazarus Book Writer | 2 shows |
| Milton Pascal Lyricist | 2 shows |
| Milton Schafer Composer | 2 shows |
| Mimi Cabanne Actor | 2 productions |
| Mischa Composer | 2 shows |
| Mitzi Green Actor | 2 productions |
| Mitzi Mayfair Actor | 2 productions |
| Mlle. Dazie Composer | 2 shows |
| Molly Picon Actor | 2 productions |
| Monica Tulia Ramirez Actor | 2 productions |
| Montego Glover Actor | 2 productions |
| Montgomery Clift Actor | 2 productions |
| Morgan Marcell Actor | 2 productions |