John Wayne

Character: Col. Cord McNally

Jorge Rivero

Character: Capt. Pierre Cordona

Jennifer O'Neill

Character: Shasta Delaney

Jack Elam

Character: Phillips

Christopher Mitchum

Character: Sgt. Tuscarora Phillips

Victor French

Character: Ketcham

Susana Dosamantes

Character: Maria Carmen

Sherry Lansing

Character: Amelita

David Huddleston

Character: Dr. Ivor Jones

Mike Henry

Character: Rio Lobo Sheriff 'Blue Tom' Hendricks

Bill Williams

Character: Blackthorne Sheriff Pat Cronin

Jim Davis

Character: Riley

Dean Smith

Character: Bide

Robert Donner

Character: Whitey Carter

George Plimpton

Character: George, Whitey's 4th Henchman

Edward Faulkner

Character: Lt. Harris

Peter Jason

Character: Lt. Ned Forsythe

Chuck Courtney

Character: Chuck, Whitey's 2nd Henchman

Robert Rothwell

Character: Whitey's 3rd Henchman

Don 'Red' Barry

Character: Feeny - Bartender (uncredited)

Sondra Currie

Character: Blackthorne Prostitute (uncredited)

Chuck Hayward

Character: (uncredited)

Conrad Hool

Character: Bart (uncredited)

Lance Hool

Character: Picket (uncredited)

John Hudkins

Character: Rio Lobo Deputy (uncredited)

Michael Jeffers

Character: Barfly in Blackthorne (uncredited)

Frank Kennedy

Character: Minor Role (uncredited)

Richard LaMarr

Character: Man in Army Post Saloon (uncredited)

John McKee

Character: Rio Lobo Deputy (uncredited)

Boyd 'Red' Morgan

Character: Train Engineer (uncredited)

William H. O'Brien

Character: Man in Army Post Saloon (uncredited)

Gregg Palmer

Character: Pete - Henchman (uncredited)

Jim Prejean

Character: Union Soldier (uncredited)

Rudy Robbins

Character: Man (uncredited)

Chuck Roberson

Character: Corporal in Baggage Car (uncredited)

Danny Sands

Character: Man Delivering Message to Jail (uncredited)

Cap Somers

Character: Card Player (uncredited)

Bob Steele

Character: Rio Lobo Deputy (uncredited)

Tommy Tedesco

Character: Guitar Player in Opening Credits (uncredited)

Ethan Wayne

Character: Boy (uncredited)

Hank Worden

Character: Hank - Hotel Clerk (uncredited)