Spencer Tracy

Dr. Henry 'Harry' Jekyll / Mr. Hyde

Ingrid Bergman

Ivy Peterson

Lana Turner

Beatrix 'Bea' Emery

Donald Crisp

Sir Charles Emery

Ian Hunter

Dr. John Lanyon

Barton MacLane

Sam Higgins

C. Aubrey Smith

The Bishop

Peter Godfrey

Poole

Sara Allgood

Mrs. Higgins

Frederick Worlock

Dr. Heath

William Tannen

Intern Fenwick

Frances Robinson

Marcia

Denis Greene

Freddie

Billy Bevan

Mr. Weller

Forrester Harvey

Old Prouty

Lumsden Hare

Colonel Weymouth

Lawrence Grant

Dr. Courtland

John Barclay

Constable

Hillary Brooke

Mrs. Arnold (uncredited)

Alec Craig

Tripped Waiter (uncredited)

Brandon Hurst

Dr. Lanyon's Butler Briggs (uncredited)

Olaf Hytten

Hobson (uncredited)

Colin Kenny

Constable (uncredited)

Doris Lloyd

Mrs. Marley (uncredited)

Aubrey Mather

Inspector (uncredited)