Niagara

Marilyn Monroe

Rose Loomis

Joseph Cotten

George Loomis

Jean Peters

Polly Cutler

Max Showalter

Ray Cutler

Denis O'Dea

Inspector Starkey

Richard Allan

Patrick

Don Wilson

Mr. J.C. Kettering

Lurene Tuttle

Mrs. Kettering

Russell Collins

Mr. Qua

Will Wright

Boatman

?

John 'Scotty' Watson

Police Officer on Aerocar (uncredited)

?

Leon Alton

Lodge Guest (uncredited)

Henry Beckman

Motorcycle Cop (uncredited)

John Brascia

Lodge Guest (uncredited)

Harry Carey Jr.

Taxi Driver (uncredited)