Cast from McQ
John Wayne
McQ
Eddie Albert
Kosterman
Diana Muldaur
Lois
Colleen Dewhurst
Myra
Clu Gulager
Toms
David Huddleston
Pinky
Julian Christopher
J.C.
Al Lettieri
Santiago
Julie Adams
Elaine
Roger E. Mosley
Rosey
William Bryant
Stan Boyle
Richard Kelton
Radical
Joe Tornatore
LaSalle
Dick Friel
Bob Mahoney
Richard Eastham
Walter Forrester
Fred Waugh
Bodyguard
Hal Needham
Santiago Henchman (uncredited)
Chuck Roberson
Santiago's Bodyguard (uncredited)
James Johnson
1st Patrol Car Officer (uncredited)