Celebrities that Play or have Played D&D

Judi Dench : plays "M" in the James Bond movies
Mike Meyers
Vin Diesel
Matthew Lillard : played "Shaggy" in the Scooby-Doo movies. Was also in Scream
Tim Duncan : Pro Basketball player
Robin Williams
Ben Affleck
Matt Damon
Kevin Smith
Darryl Hannah : Kill Bill, Splash, Grumpy Old Men
Jon Favreau : Directed Iron Man; claims D&D gives him a lot of his inspiration
Joss Whedon : Co-wrote Toy Story, Buffy the Vampire Slayer. Directed Serenity
Stephen Colbert : Comedic actor "Strangers with Candy". Tried to get on the democratic presidential ticket in '08.
Ewen McGregor : Star Wars Episode I (Obi Wan Knobi)
Will Wheaton : Wesley Crusher on Start Trek: Next Gen (reported as playing while on set)
Brian Posehn : Sarah Silverman Show, Aqua Teen Hunger Force, Fantastic Four (Silversurfer)
Tom Hanks
Rivers Cuomo : Singer in Weezer; sings about his DMG in song "In The Garage"
Jennifer Lopez
John Dolmayan : Drummer for System of a Down
Johnny Knoxville
Asia Carrera : Porn Star
Bruce Campbell
Carrot Top
Catherine Zeta-Jones
Dave Chapelle
Elijah Wood
Emilio Estevez
George Lucas
Harrison Ford
Jack Black
Jason Alexander : "George" from Seinfeld
Kobe Bryant
Marilyn Manson
Metallica
Nelly
Parker Posey : Scream 3, Blade: Trinity
Quentin Tarantino
Rush (band)
Sarah Michelle Gellar
Sean Astin : Goonies, "Samwise" Lord of the Rings
Brian May : Guitarist for Queen
Dolph Lundgren