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)