Jena Malone Carine McCandless / Additional Narration (voice)
Kristen Stewart Tracy Tatro
Catherine Keener Jan Burres
Jack Nicholson Thanks
Sean Penn Producer, Screenplay, Director
Zach Galifianakis Kevin
Vince Vaughn Wayne Westerberg
Emile Hirsch Christopher McCandless / Alexander Supertramp
Marcia Gay Harden Billie McCandless
Merritt Wever Lori
Thure Lindhardt Mads
William Hurt Walt McCandless
Hal Holbrook Ronald "Ron" Franz
R. D. Call Bull
Haley Ramm Carine McCandless (age 11)
Cole S. McKay Stunts
Francine Maisler Casting
Gary Archer Prosthetics
Signe Egholm Olsen Sonja
Mary Claire Hannan Costume Design
Lora Hirschberg Sound Re-Recording Mixer
Mychael Bates Property Master
John J. Kelly Executive Producer
Cheryl Francis Harrington Social Worker
Eddie Vedder Songs, Music
Robin Mathews Gail Borah, Makeup Department Head
Art Linson Producer
Aaron Wayne Hill Big Wheel Boy (uncredited)
Chris Regan Color Timer
Haley Sweet Bank Teller (uncredited), Production Supervisor
Nerses Gezalyan Sound Mixer
Derek R. Hill Production Design
Christopher Barnett Sound Effects Editor
J. Nathan Simmons Tourist (uncredited)
Michael Minkler Sound Re-Recording Mixer
Frank Hildebrand Executive Producer
Arturo Zarate Sound Effects Editor
Martín Hernández Supervising Sound Editor, Sound Designer
Steven Wiig Lee's Ferry Ranger
Jon Krakauer Book, Thanks
Brian H. Dierker Rainey
Domenic Silvestri Art Direction
Bill Pohlad Producer
Rod Park Visual Effects Producer
Chuck Zlotnick Still Photographer
Éric Gautier Director of Photography
Lyn Matsuda Norton Script Supervisor
Donald Frazee Special Effects Supervisor
David Franco Music Supervisor
John Jabaley Announcer
Critter Pierce Set Costumer
Gary J. Wayton Stunts
David Webb Assistant Director
David Blocker Executive Producer
Sterfon Demings Hair Department Head
Edward Tise Sound Mixer
Bart the Bear 2 Bear
John Richardson Art Direction
Kathy Driscoll-Mohler Casting Associate
Steve Hart Stunts
Danielle Berman Set Decoration
Lauren Grey Casting Associate
Jacques Jouffret Steadicam Operator
Luca Kouimelis Script Supervisor
Amy Fegely Set Costumer
Michael Brook Original Music Composer
Bryce Walters Christopher McCandless (age 4)
Kaki King Music
Brinton Bryan Second Unit
Jay Cassidy Editor
Parris Mosteller Young Boy (voice) (uncredited)
Jacqueline Aronson Costume Supervisor