Farley Granger as Guy Haines

Ruth Roman as Anne Morton

Robert Walker as Bruno Antony

Leo G. Carroll as Sen. Morton

Patricia Hitchcock as Barbara Morton

Kasey Rogers as Miriam Haines

Marion Lorne as Mrs. Antony

Jonathan Hale as Mr. Antony

Howard St. John as Police Capt. Turley

John Brown as Prof. Collins

Norma Varden as Mrs. Cunningham

Robert Gist as Det. Leslie Hennessey

Brooks Benedict as Tennis Umpire (uncredited)

John Doucette as Det. Hammond (uncredited)

Harry Hines as Man Under Merry-Go-Round (uncredited)

Alfred Hitchcock as Man Boarding Train Carrying a Double Bass (uncredited)

Paul McGuire as Train Passenger (uncredited)

Oliver Cross as Party Guest (uncredited)

Tom Ferrandini as Linesman (uncredited)

Stuart Hall as Tennis Match Spectator (uncredited)

Joel Allen as Policeman (uncredited)

Murray Alper as Boatman (uncredited)

Monya Andre as Dowager (uncredited)

Benjie Bancroft as Police Officer (uncredited)

Harry Baum as Tennis Match Spectator (uncredited)

Al Bridge as Tennis Judge (uncredited)

Joe Brooks as Carnival Patron (uncredited)

John Butler as Blind Man (uncredited)

Leonard Carey as Anthonys' Butler (uncredited)

Edward Clark as Miriam's Boss (uncredited)

Jack Cushingham as Fred Reynolds (uncredited)

John Daheim as Detective at Merry-Go-Round (uncredited)

Marilyn Dialon as Girl on Carousel (uncredited)

Jay Eaton as General - Party Guest (uncredited)

Roy Engel as Policeman (uncredited)

Herbert Evans as Party Guest (uncredited)

Franklyn Farnum as Party Guest (uncredited)

Tommy Farrell as Miriam's Boyfriend (uncredited)

Sam Flint as Train Passenger Requesting Light (uncredited)

Kay Garrett as Tennis Match Spectator (uncredited)

Robert Haines as Bus Driver (uncredited)

Sam Harris as Party Guest (uncredited)

Edward Hearn as Lt. Campbell (uncredited)

Al Hill as Carnival Game Proprietor (uncredited)

Mary Alan Hokanson as Secretary (uncredited)

Edna Holland as Mrs. Joyce (uncredited)

J. Louis Johnson as Mortons' Butler (uncredited)

Fred Kelsey as Tennis Match Spectator / Carnival Attendee (uncredited)

Mike Lally as Detective at Carnival (uncredited)

Perc Launders as Police Desk Sergeant (uncredited)

Louis Lettieri as Boy with Balloon (uncredited)

George Magrill as Policeman at Merry-Go-Round (uncredited)

Charles Marsh as Bystander at Drain (uncredited)

Thomas Martin as Party Guest (uncredited)

David McMahon as Bystander at Drain (uncredited)

Charles Meredith as Judge Donahue (uncredited)

Ralph Moody as Seedy Man at Carnival (uncredited)

Mike Morelli as Boatman (uncredited)

Roland Morris as Miriam's Boyfriend (uncredited)

Odette Myrtil as Madame Darville (uncredited)

Richard Neill as Party Guest (uncredited)

Barry Norton as Tennis Match Spectator (uncredited)

Spec O'Donnell as Carnival Patron (uncredited)

Paul Panzer as Bystander at Merry-Go-Round (uncredited)

Minna Phillips as Dowager (uncredited)

Anthony Redondo as Train Passenger (uncredited)

Georges Renavent as Monsieur Darville (uncredited)

Suzanne Ridgway as Bystander at Merry-Go-Round (uncredited)

Dick Ryan as Minister (uncredited)

Charles Sherlock as Cop (uncredited)

Janet Stewart as Girl (uncredited)

Brick Sullivan as Carnival Patron (uncredited)

Shirley Tegge as Girl (uncredited)

Laura Treadwell as Mrs. Anderson (uncredited)

Joe Warfield as Soda Jerk (uncredited)

Howard Washington as Waiter on Train (uncredited)

Dick Wessel as Bill (uncredited)

Chalky Williams as Carnival Patron (uncredited)

Robert B. Williams as Bystander at Drain (uncredited)