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.
| Mabel Barrison Actor | 3 productions |
| Mabel Taliaferro Actor | 3 productions |
| Malcolm Gets Actor | 3 productions |
| Malcolm Lee Beggs Actor | 3 productions |
| Mamie Duncan-Gibbs Actor | 3 productions |
| Mantan Moreland Actor | 3 productions |
| Marc Breaux Actor, Choreographer | 3 productions |
| Marc Platt Actor | 3 productions |
| Margaret Hamilton Actor | 3 productions |
| Marguerite Benton Actor | 3 productions |
| Marie Powers Actor | 3 productions |
| Marilyn Gennaro Actor | 3 productions |
| Marion Marlowe Actor | 3 productions |
| Marisha Wallace Actor | 3 productions |
| Marta Eggerth Actor | 3 productions |
| Martha Wright Actor | 3 productions |
| Martin Short Actor, Book Writer | 3 productions |
| Marty Thomas Actor | 3 productions |
| Mary Birdsong Actor | 3 productions |
| Mary Lawlor Actor | 3 productions |
| Maryann Plunkett Actor | 3 productions |
| Matt Castle Actor | 3 productions |
| Matt Cavenaugh Actor | 3 productions |
| Matt Mattox Actor, Choreographer | 3 productions |
| Matthew Gumley Actor | 3 productions |
| Maureen Cannon Actor | 3 productions |
| Maureen McGovern Actor | 3 productions |
| Maurice Edwards Actor | 3 productions |
| Maurice Ellis Actor | 3 productions |
| May Boley Actor | 3 productions |
| McKenzie Kurtz Actor | 3 productions |
| Megan Lawrence Actor | 3 productions |
| Megan Mullally Actor | 3 productions |
| Melissa Rae Mahon Actor | 3 productions |
| Melody Butiu Actor | 3 productions |
| Michael Cumpsty Actor | 3 productions |
| Michael De Marco Actor | 3 productions |
| Michael Esper Actor | 3 productions |
| Michael Urie Actor | 3 productions |
| Michael Winther Actor | 3 productions |
| Michele Burke Actor | 3 productions |
| Michele Lee Actor | 3 productions |
| Michelle Blakely Actor | 3 productions |
| Mickey Calin Actor | 3 productions |
| Mildred Natwick Actor | 3 productions |
| Mitchell Jarvis Actor | 3 productions |
| Murvyn Vye Actor | 3 productions |
| Nicholas Christopher Actor | 3 productions |
| Nick Corley Actor | 3 productions |
| Nick Rehberger Actor | 3 productions |
| Nick Wyman Actor | 3 productions |
| Norma Donaldson Actor | 3 productions |
| Norma Terris Actor | 3 productions |
| Norman Shelly Actor | 3 productions |
| Onna White Actor, Choreographer, Director | 3 productions |
| Orville Mendoza Actor | 3 productions |
| Pamela Myers Actor | 3 productions |
| Pat Gorman Actor | 3 productions |
| Pat Stanley Actor | 3 productions |
| Patina Miller Actor | 3 productions |