Jon Finch as Richard Ian Blaney

Barry Foster as Robert Rusk

Barbara Leigh-Hunt as Brenda Margaret Blaney

Anna Massey as Barbara Jane 'Babs' Milligan

Alec McCowen as Chief Inspector Tim Oxford

Vivien Merchant as Mrs. Oxford

Billie Whitelaw as Hetty Porter

Clive Swift as Johnny Porter

Bernard Cribbins as Felix Forsythe

Michael Bates as Sergeant Spearman

Jean Marsh as Monica Barling

Madge Ryan as Mrs. Davison

Elsie Randolph as Gladys

Gerald Sim as Mr. Usher the Solicitor in Pub

John Boxer as Sir George

George Tovey as Neville Salt

Jimmy Gardner as Hotel Porter

Noel Johnson as Doctor in Pub

Alfred Hitchcock as Spectator at Opening Rally (uncredited)

Lewis Alexander as Man in Crowd (uncredited)

Brian Badcoe as Man in Crowd (uncredited)

Michael Bilton as Trial Jury Foreman (uncredited)

Joby Blanshard as Man in Crowd (uncredited)

Willy Bowman as Man in Crowd (uncredited)

Jim Brady as Juror (uncredited)

Donald Campbell as The Mayor (uncredited)

John Cannon as Murder Scene Policeman (uncredited)

John Cater as Man in Crowd (uncredited)

Pauline Chamberlain as Woman in Crowd (uncredited)

Terence Conoley as Man in Crowd (uncredited)

Gerry Cowper as Spectator at Opening Rally (uncredited)

Maxwell Craig as Fruit Buyer (uncredited)

June Ellis as Maisie - Barmaid (uncredited)

Hugh Elton as Man in Crowd (uncredited)

Mabel Etherington as Restaurant Patron (uncredited)

Charles Farrell as Complaining Pub Customer (uncredited)

Harry Fielder as Covent Garden Lorry Driver (uncredited)

Otto Friese as Juror (uncredited)

Alan Gibbs as Man in Crowd (uncredited)

Roberta Gibbs as Body in River Thames (uncredited)

Jill Goldston as Woman in Crowd (uncredited)

John Golightly as CID Police Photographer (uncredited)

Josie Grant as Woman in Crowd (uncredited)

Aidan Harrington as Man in Crowd (uncredited)

Victor Harrington as Spectator on South Bank (uncredited)

Drewe Henley as Forensics Technician (uncredited)

Hubert Hill as Man in Crowd (uncredited)

Ken Hutchins as Man in Crowd (uncredited)

Barry Keegan as Hospital Patient (uncredited)

Juba Kennerley as Restaurant Patron (uncredited)

Roy Lansford as Man in Crowd (uncredited)

Ricky Lansing as Market Worker (uncredited)

Tommy Little as Man in Crowd (uncredited)

Doreen Mantle as Woman in Crowd (uncredited)

Mary Maxfield as Restaurant Patron (uncredited)

Bunny May as Barman (uncredited)

Margaret Nolan as Young Woman (uncredited)

James Payne as Covent Garden Taxi Driver (uncredited)

Bob Ramsey as Man in Pub (uncredited)

Robert Rietti as Doctor (voice) (uncredited)

Phillip Ross as Policeman (uncredited)

Michael Sheard as Jim (uncredited)

Jack Silk as Police Driver (uncredited)

Roy Skelton as CID Man (uncredited)

Colin Spaull as Man (uncredited)

Richard Wyler as Truck Driver (uncredited)

Reg Thomason as Court Official (uncredited)

Susan Travers as Victim (uncredited)

Joseph Tregonino as Pub Patron (uncredited)

Paul Tropea as Boy at the Thames (uncredited)

Bert Vivian as Man in Crowd (uncredited)

Pearl Walters as Restaurant Patron (uncredited)

Rita Webb as Mrs Rusk (uncredited)

Eric Wetherell as Juror (uncredited)

Fred Wood as Pub Patron (uncredited)

Martin Wyldeck as Sir George's Aide (uncredited)

Jeremy Young as Detective (uncredited)