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