Jake GyllenhaalDonnie Darko
Jena MaloneGretchen Ross
James DuvalFrank
Drew BarrymoreKaren Pomeroy
Beth GrantKitty Farmer
Maggie GyllenhaalElizabeth Darko
Mary McDonnellRose Darko
Holmes OsborneEddie Darko
Noah WyleProf. Kenneth Monnitoff
Katharine RossDr. Lilian Thurman
Patrick SwayzeJim Cunningham
Daveigh ChaseSamantha Darko
Arthur TaxierDr. Fisher
David St. JamesBob Garland
Patience ClevelandRoberta Sparrow / Grandma Death
Jazzie MahannahJoanie James
Jolene PurdyCherita Chen
David MorelandPrincipal Cole
Kristina MalotaSusie Bates
Marina MalotaEmily Bates
Scotty LeavenworthDavid
Phyllis LyonsAnne Fisher
Gary LundySean Smith
Alex GreenwaldSeth Devlin
Stuart StoneRonald Fisher
Joan BlairMystery Woman
Seth RogenRicky Danforth
Mark HoffmanPolice Officer
Jerry TrainorLanky Kid
Tom TangenMan in Red Jogging Suit
Carly NaplesSuzy Bailey
Lisa K. WyattLinda Connie
Rachel WinfreeShanda Riesman
Ashley TisdaleKim
Tiler PeckBeth Farmer
Fran KranzPassanger
Sarah HudsonFriend
Alison JonesDorky Half-Sister
Lee WeaverLeroy
Jack Salvatore, Jr.Larry Riesman