John Mills

as Terence Sullivan

Dirk Bogarde

as Matt Sullivan

Robert Beatty

as Shinto

Elizabeth Sellars

as Maureen Fagan

Barbara Mullen

as Molly Fagan

Eddie Byrne

as Flynn

Joseph Tomelty

as Dr Brannigan

Gilbert Harding

as Henry Truethome

James Kenney

as Johnny Fagan

Liam Redmond

as Connolly

Jack MacGowran

as Patsy McGuire

Michael Golden

as Murphy

Neil Wilson

as Police Constable at Tube Station (uncredited)

Stephen Dunne

as Brennan (uncredited)

Patric Doonan

as Sentry (uncredited)

John Orchard

as Sentry (uncredited)

Terence Alexander

as Ship's Officer (uncredited)

Harry Brogan

as Barney (uncredited)

Harry Hutchinson

as Bill - Detective (uncredited)

Doris Yorke

as English Landlady (uncredited)

Patricia Stewart

as Girl at Docks (uncredited)

Johnnie Schofield

as ARP Warden (uncredited)

Jean St. Clair

as Rosie O'Flaherty (uncredited)

Seamus Kavanagh

as Publican (uncredited)

Jack Rodney

as IRA Driver (uncredited)

Edward Byrne

as Ambulance Attendant (uncredited)

Tony Quinn

as Ambulance Attendant (uncredited)

E.J. Kennedy

as Telephone Exchange Official (uncredited)

John Warwick

as Prisoner's Escort on Ship (uncredited)