4,750 actors 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.
| Mary Wickes Actor | 2 productions |
| 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 |
| Mauricio Mendoza Actor | 2 productions |
| Max Casella Actor | 2 productions |
| Max Figman Actor, Director | 2 productions |
| Max Hoffman Jr. Actor | 2 productions |
| Maxwell Glanville Actor | 2 productions |
| Maya Bowles Actor | 2 productions |
| Meg Mundy Actor | 2 productions |
| Megan Hilty Actor | 2 productions |
| 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 Crawford Actor | 2 productions |
| Michael Fesco Actor | 2 productions |
| Michael Hayden Actor | 2 productions |
| Michael Ingram Actor | 2 productions |
| 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 |
| 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 |
| Mimi Cabanne Actor | 2 productions |
| Mitzi Green Actor | 2 productions |
| Mitzi Mayfair Actor | 2 productions |
| 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 |
| Myrna Aaron Actor | 2 productions |
| Myron McCormick Actor | 2 productions |
| M’el Dowd Actor | 2 productions |
| Nan McFarland Actor | 2 productions |
| Nana Bryant Actor | 2 productions |
| Nancy Callman Actor | 2 productions |
| Natalie Cortez Actor | 2 productions |
| Natalie Toro Actor | 2 productions |
| Natascia Diaz Actor | 2 productions |
| Nichelle Lewis Actor | 2 productions |
| Nicholas Joy Actor | 2 productions |
| Nick Dana Actor | 2 productions |
| Nick Jonas Actor | 2 productions |
| Nick Sullivan Actor | 2 productions |