The Great John L.

Linda Darnell

Anne Livingston

Greg McClure

John L. Sullivan

Barbara Britton

Kathy Harkness

Otto Kruger

Richard Martin

Wallace Ford

McManus

George Mathews

John Flood

Robert Barrat

Billy Muldoon

Joel Friedkin

Michael Sullivan

Simon Semenoff

Mons. Claire

Harry Crocker

Arthur Brisbane

Rory Calhoun

James J. 'Gentleman Jim' Corbett

J.M. Kerrigan

Father O'Malley

Fritz Feld

Claire's manager

Lee Sullivan

Mickey Steele

Eddie Kane

Promoter

Jerry Maren

Midget

Ernie Adams

Waiter (uncredited)

Guy Bellis

(uncredited)

Ted Billings

Fight Spectator (uncredited)

Freddie Steele

(uncredited)