John Wayne
Col. Cord McNally
Acting
Jorge Rivero
Capt. Pierre Cordona
Acting
Jennifer O'Neill
Shasta Delaney
Acting
Jack Elam
Phillips
Acting
Christopher Mitchum
Sgt. Tuscarora Phillips
Acting
Victor French
Ketcham
Acting
Susana Dosamantes
Maria Carmen
Acting
Sherry Lansing
Amelita
Acting
David Huddleston
Dr. Ivor Jones
Acting
Mike Henry
Rio Lobo Sheriff 'Blue Tom' Hendricks
Acting
Bill Williams
Blackthorne Sheriff Pat Cronin
Acting
Jim Davis
Riley
Acting
Dean Smith
Bide
Acting
Robert Donner
Whitey Carter
Acting
George Plimpton
George, Whitey's 4th Henchman
Acting
Edward Faulkner
Lt. Harris
Acting
Peter Jason
Lt. Ned Forsythe
Acting
Chuck Courtney
Chuck, Whitey's 2nd Henchman
Acting
Robert Rothwell
Whitey's 3rd Henchman
Acting
Don 'Red' Barry
Feeny - Bartender (uncredited)
Acting
Sondra Currie
Blackthorne Prostitute (uncredited)
Acting
Chuck Hayward
(uncredited)
Acting
Conrad Hool
Bart (uncredited)
Production
Lance Hool
Picket (uncredited)
Production
John Hudkins
Rio Lobo Deputy (uncredited)
Acting
Michael Jeffers
Barfly in Blackthorne (uncredited)
Acting
Frank Kennedy
Minor Role (uncredited)
Acting
Richard LaMarr
Man in Army Post Saloon (uncredited)
Acting
John McKee
Rio Lobo Deputy (uncredited)
Acting
Boyd 'Red' Morgan
Train Engineer (uncredited)
Acting
William H. O'Brien
Man in Army Post Saloon (uncredited)
Acting
Gregg Palmer
Pete - Henchman (uncredited)
Acting
Jim Prejean
Union Soldier (uncredited)
Acting
Rudy Robbins
Man (uncredited)
Acting
Chuck Roberson
Corporal in Baggage Car (uncredited)
Acting
Danny Sands
Man Delivering Message to Jail (uncredited)
Acting
Cap Somers
Card Player (uncredited)
Acting
Bob Steele
Rio Lobo Deputy (uncredited)
Acting
Tommy Tedesco
Guitar Player in Opening Credits (uncredited)
Sound
Ethan Wayne
Boy (uncredited)
Acting
Hank Worden
Hank - Hotel Clerk (uncredited)
Acting