Must Be Pop Masterlist
- Mads Mikkelsen - actor
- Maggie Grace - actress
- Malin Ackerman - actress
- Mandy Moore - musician, actress
- Marc Blucas - actor
- Marc Methot - athlete, hockey, Columbus Blue Jackets
- Marc Staal - athlete, hockey player, New York Rangers
- Marc-Andre Bourdon - athlete, hockey player, Philadelphia Flyers
- Marc-Andre Fleury - athlete, hockey player, Pittsburgh Penguins - CLOSING, CHOSING REPLACEMENT UNTIL 10/17/10
- Marco Dapper - actor
- Maria Taylor - musician, CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Marie Osmond - actress, musician
- Marilyn Manson - musician, CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Marina Diamandis - musician, Marina and the Diamonds
- Marion Cotillard - actress
- Marisa Miller - model
- Mark Hoppus - musician
- Mark Oliver Everett - musician, Eels
- Mark Salling - actor, musician
- Marshall Mathers aka Eminem - musician
- Martin Biron - athlete, hockey, New York Rangers
- Martin Gore - musician, Depeche Mode
- Martin Johnson - musician, Boys Like Girls
- Martin St-Louis - athlete, hockey player, Tampa Bay Lightning (held permanently for personal reasons)
- Martina McBride - musician - CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Mary Elizabeth Winstead - actress
- Mason Raymond - athlete, hockey player, Vancouver Canucks
- Mathieu Garon - athlete, hockey player, Columbus Blue Jackets
- Matt "M.Shadows" Sanders - musician, Avenged Sevenfold
- Matt Bellamy - musician, Muse
- Matt Carle - athlete, hockey, Philadelphia Flyers
- Matt Cooke - athlete, hockey player, Pittsburgh Penguins
- Matt Dallas - actor
- Matt Niskanen - athlete, hockey player, Dallas Stars
- Matt Skiba - musician, Alkaline Trio, CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Matt Smith - actor
- Matt Stajan - athlete, hockey, Calgary Flames
- Matthew Bomer - actor
- Matthew Davis - actor
- Matthew Goode - actor
- Matthew Gray Gubler - actor
- Matthew Hunwick - athlete, hockey, Boston Bruins
- Matthias Ohlund - athlete, hockey player, Tampa Bay Lightning
- Max Pacioretty - athlete, hockey player, Montreal Canadiens
- Megan Fox - actress
- Meghan Agosta - athlete, hockey player, Canadian Women's Olympic Team
- Meghan Mikkelson - athlete, hockey, Canadian Women's Olympic Team
- Melissa Auf der Maur - musician, formerly Hole and Smashing Pumpkins, CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Melissa O'Neil - musician, Canadian Idol 3, CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Meryl Streep - actress
- Michael Aronov - actor, CANNOT BE PORTRAYED PER CELEB'S REQUEST
- Michael Cera - actor
- Michael Del Zotto - athlete, hockey, New York Rangers
- Michael Fassbender - actor
- Michael Leighton - athlete, hockey player, Philadelphia Flyers
- Michael Phelps - athlete, swimmer
- Michael Pitt - actor
- Michael Pritchard aka Mike Dirnt - musician, Green Day
- Michael Rosenbaum - actor
- Michael Ryder - athlete, hockey, Boston Bruins
- Michael Stipe - musician, R.E.M.
- Michelle Monaghan - actress
- Michelle Rodriguez - actress
- Michelle Williams - actress
- Mike Commodore - athlete, hockey player, Columbus Blue Jackets
- Mike Green - athlete, hockey player, Washington Capitals
- Mike Ratchuk - athlete, hockey, Columbus Blue Jackets
- Mike Richards - athlete, hockey player, Philadelphia Flyers
- Mike Smith - athlete, hockey, Tampa Bay Lightning
- Mila Kunis - actress
- Milan Lucic - athlete, hockey player, Boston Bruins
- Miley Cyrus - musician, actress
- Minka Kelly - actress
- Miranda Kerr - model
- Miranda Lambert - musician - CANNOT BE PORTRAYED WITHOUT MODERATOR PERMISSION
- Misha Collins - actor
- Mitch Hewer - actor
- Molly Shannon - actress, comedienne