Margaret O'Hara / Knowles

Shirley Temple

Shawn O'Hara

Barry Fitzgerald

Ted Knowles

Lon McCallister

Mrs. Charles S. Howard

Rosemary DeCamp

George Carson

Donald MacBride

Charles S. Howard

Pierre Watkin

Thomas Millford

William Forrest

Race Commentator

Joe Hernandez

Murphy

'Sugarfoot' Anderson

Race Commentator

Hal J. Moore

Jockey George Woolf

Bill Cartledge

Race Commentator

Clem McCarthy

Buyer

Forbes Murray

Oscar's Wife (uncredited)

Gertrude Astor

Buyer

Edward Keane

Oscar

Creighton Hale

Himself (archive footage)

Seabiscuit

Buyer

Lew Harvey

Cameraman (uncredited)

Ray Erlenborn

Seabiscuit (close-ups)

Sea Sovereign

Buyer

Herman Kantor

Fred Baker

Gil Warren

Himself (archive footage) (uncredited)

War Admiral

Spectator (uncredited)

Alan Foster

Wong the O'Hara's Cook

Joe Wong

Swipe (uncredited)

James Simmons

Miss Finch

Ezelle Poule

Libby

Madame Sul-Te-Wan

Spectator

Jack Loman

Alice Talbot - Nurse (uncredited)

Dee Carroll