Heath Ledger as Ennis Del Mar

Jake Gyllenhaal as Jack Twist

Michelle Williams as Alma Beers

Anne Hathaway as Lureen Newsome

Randy Quaid as Joe Aguirre

Linda Cardellini as Cassie Cartwright

Anna Faris as Lashawn Malone

David Harbour as Randall Malone

Roberta Maxwell as Jack's Mother

Kate Mara as Alma Del Mar Jr. (age 19)

Peter McRobbie as John Twist

Graham Beckel as L.D. Newsome

Mary Liboiron as Fayette Newsome

Scott Michael Campbell as Monroe

Marty Antonini as Timmy

David Trimble as Basque

Larry Reese as Jolly Minister

Valerie Planche as Waitress

Victor Reyes as Chilean Sheepherder #1

Lachlan Mackintosh as Chilean Sheepherder #2

Tom Carey as Rodeo Clown

Don Bland as Biker #1

Steven Cree Molison as Biker #2

Duval Lang as Announcer

Dan McDougall as Bartender #1

Dean Barrett as Bartender #2

Kade Phillips as Ennis Del Mar (age 9)

Steffen Cole Moser as K.E. Del Mar (age 11)

Cheyenne Hill as Alma Del Mar Jr. (age 13)

Cayla Wolever as Jenny Del Mar (age 11)

Sarah Hyslop as Alma Del Mar Jr. (age 9-12)

Jacey Kenny as Jenny Del Mar (age 7-8)

Keanna Dubé as Alma Del Mar Jr. (age 5)

Brooklynn Proulx as Jenny Del Mar (age 4)

Hannah Stewart as Alma Jr. (age 3)

Jake Church as Bobby Twist (age 10)

James Baker as Farmer #1

Pete Seadon as Farmer #2

Jerry Callaghan as Judge

Ken Zilka as Roughneck #1

John Tench as Roughneck #2

Will Martin as Carl

Gary Lauder as Killer Mechanic

Christian Fraser as Grease Monkey

Cam Sutherland as Assailant

Barb Mitchell as Western Dancer (uncredited)

Rodrigo Prieto as Young Mexican (uncredited)

Ken Roberts as Signal Bartender (uncredited)

Kailin See as Hippy Girl (uncredited)

Jayson Therrien as Bar Patron (uncredited)

Erika Walter as Waitress #2 (uncredited)