John Wayne character Colonel Cord McNally
Jorge Rivero character Captain Pierre Cordona (Frenchy)
Jennifer O'Neill character Shasta Delaney
Jack Elam character Phillips
Christopher Mitchum character Seargent Tuscarora Phillips
Victor French character Ketcham
Susana Dosamantes character Maria Carmen
Sherry Lansing character Amelita
David Huddleston character Dr. Ivor Jones
Jim Davis character Rio Lobo Deputy
Robert Donner character Deputy Whitey Carter
George Plimpton character Fourth Gunman
Edward Faulkner character Lt. Harris
Peter Jason character Lt. Ned Forsythe
Chuck Courtney character Chuck
Robert Rothwell character Third Gunman
Bill Williams character Blackthorne Sheriff Pat Cronin
Mike Henry character Rio Lobo Sheriff 'Blue Tom' Hendricks
Jim Prejean character Union Soldier
Hank Worden character Hank, the hotel desk clerk
