Gary Cooper as Beau Geste

Ray Milland as John Geste

Robert Preston as Digby Geste

Brian Donlevy as Sergeant Markoff

Susan Hayward as Isobel Rivers

J. Carrol Naish as Rasinoff

Albert Dekker as Schwartz

Broderick Crawford as Hank Miller

Charles Barton as Buddy McMonigal

James Stephenson as Major Henri de Beaujolais

Heather Thatcher as Lady Patricia Brandon

James Burke as Lieutenant Dufour

G.P. Huntley as Augustus Brandon

Harold Huber as Voisin

Donald O'Connor as Beau Geste (as a Child)

Billy Cook as John Geste (as a Child)

Martin Spellman as Digby Geste (as a Child)

Ann Gillis as Isobel Rivers (as a Child)

David Holt as Augustus Brandon (as a Child)

Harvey Stephens as Lieutenant Martin

Stanley Andrews as Maris

Harry Woods as Renoir

Arthur Aylesworth as Renault, a deserter

Henry Brandon as Renouf, another deserter

Barry Macollum as Krenke

Ronald R. Rondell as A Bugler

Joseph E. Bernard as Legionnaire (uncredited)

George Chandler as Legionnaire Cordier (uncredited)

Joseph William Cody as Legionnaire (uncredited)

Joe Colling as Trumpeter O. Leo (uncredited)

Gino Corrado as Recruit Wearing Top Hat (uncredited)

Frank Dawson as Burdon - Butler (uncredited)

Joe Gray as Legionnaire (uncredited)

Duke Green as Legionnaire Glock (uncredited)

Thomas E. Jackson as Colonel in Recruiting Office (uncredited)

Gladys Jeans as Girl in Saida Cafe (uncredited)

Bob Kortman as Maharaja's Agent (uncredited)

Larry Lawson as Legionnaire (uncredited)

Tony Martelli as Minor Role (uncredited)

Francis McDonald as Arab Scout (uncredited)

Nestor Paiva as Corporal Golas (uncredited)

Bob Perry as Bald Legionnaire (uncredited)

George Regas as Arab Scout (uncredited)

Jerome Storm as Sergeant Major (uncredited)

Henry Sylvester as Legionnaire (uncredited)

Carl Voss as Legionnaire (uncredited)

Joe Whitehead as Sergeant (uncredited)

Harry Worth as Corporal (uncredited)