Gary Cooper (Michael "Beau" Geste)
Ray Milland (John Geste)
Robert Preston (Digby Geste)
Brian Donlevy (Sgt. Markoff)
Susan Hayward (Isobel Rivers)
Jerome Storm (Sergeant Major)
Francis McDonald (Arab Scout)
George Regas (Arab Scout)
Harry Worth (Corporal)
Joe Whitehead (Sergeant)
Nestor Paiva (Corporal Golas)
Bob Perry (Legionnaire (uncredited))
Henry Sylvester
G.P. Huntley (Augustus Brandon)
Duke Green (Glock)
Thomas E. Jackson (Colonel in Recruiting Office)
J.W. Cody (Legionnaires)
Larry Lawson (Legionnaire)
Frank Dawson (Burdon, the Butler)
Carl Voss
George Chandler (Cordier)
Joe Bernard (Legionnaire)
James Stephenson (Maj. Henri de Beaujolais)
Heather Thatcher (Patricia Brandon)
James Burke (Lieutenant Dufour)
Arthur Ayleswofth (Renault)
Harry Woods (Renoir)
Harold Huber (Voisin)
Stanley Andrews (Maris)
Donald O'Connor (Beau at Age Twelve)
Billy Cook (John at Age Ten)
Martin Spellman (Digby at Age Twelve)
David Holt (Augustus at Age Twelve)
Ann Gillis (Isolvel at Age Ten)
Harvey Stephens (Lieutenant Martin)
Henry Brandon (Renouf)
Barry Macollum (Krenke)
Ronnie Rondell (Bugler)
J. Carrol Naish (Rasinoff)
Albert Dekker (Schwartz)
Broderick Crawford (Hank Miller)
Charles Barton (Buddy McMonigal)