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 Spanish Aerocar (uncredited)

Leon Alton

Lodge Guest (uncredited)

Henry Beckman

Motorcycle Cop (uncredited)

John Brascia

Lodge Guest (uncredited)

Harry Carey Jr.

Taxi Driver (uncredited)

Bill Coontz

Young Man (uncredited)

Roy Damron

Lodge Guest (uncredited)

Robert Ellis

Young Man (uncredited)

Howard Engel

Man at Bus Stop (uncredited)

Neil Fitzgerald

Customs Officer (uncredited)

Bess Flowers

Undetermined Secondary Role (uncredited)

Gloria Gordon

Dancer (uncredited)

Patricia Henderson

(uncredited)

Winifield Hoeny

Straw Boss (uncredited)

George Ives

Carillon Tower Guide (uncredited)

Arch Johnson

Police Driver (uncredited)

Lester Matthews

Doctor (uncredited)

Sean McClory

Sam (uncredited)

Norman McKay

Morris (uncredited)

Audre Monture

Woman in Gift Shop (uncredited)

Patrick O'Moore

Detective (uncredited)

Tom Reynolds

Husband (uncredited)

Willard Sage

Motorcycle Cop (uncredited)

Bert Stevens

Doctor (uncredited)

Minerva Urecal

Mrs. McGrand (uncredited)

Nina Varela

Wife (uncredited)

Gene Wesson

Guide (uncredited)