Farley Granger
William Calhoun Denny

Shelley Winters
Katherine "Kate" Denny

William Demarest
O'Ryan

Francis L. Sullivan
Fat Freddy

Margalo Gillmore
Kate's Mother

Lon Chaney Jr.
Pinky

Hans Conried
Norbert Gillespie

Elisha Cook Jr.
Albert Jonas

Glenn Anders
Pete the Pusher

Allen Jenkins
Police Plainclothesman

Sheldon Leonard
Shortwave Bert

Marvin Kaplan
Max the Umbrella

Henry Corden
Numi

Don Beddoe
Sgt. O'Neill (uncredited)

Kathleen Freeman
Pet Shop Proprietor's Wife (uncredited)

Herb Vigran
Police Desk Sergeant (uncredited)

King Donovan
Lingerie Shop Proprietor (uncredited)