- Country: UK
- Genres: Crime, Drama, Thriller
- Release: 1963-11-29
- Director: Ken Annakin
- Writers: Douglas Warner , Alun Falconer , Paul Durst
- Language: English
- Stars: Nigel Patrick , Margaret Whiting , Katherine Woodville , Colin Blakely (1930–1987) , Derren Nesbitt , Harry Andrews , Michael Coles , John Cowley , Allan Cuthbertson , Frank Finlay
- Runtime: 105 min
- Awards: N/A
- AKA: The Informers (United Kingdom) , The Informers of the Underworld (Ireland) , De onderwereld slaat toe (Netherlands the) , The Snout (United Kingdom) , Polizeispitzel X 2 , The Informers , Os denunciantes (Portugal, Portuguese Republic) , Underworld Informers (Canada) , L'indic (France, French Republic) , ギャング情報 (Japan) , O katadotis tis Scotland Yard (Greece) , Imperio de violencia (Spain) , Doppio gioco a Scotland Yard (Italy) , London på vrangen (Denmark) , Rape of the Underworld (United Kingdom) , A Lei dos Facínoras (Brazil) , Informatorii (Romania) , Underworld Informers (United States of America) , Oi katadotes (Greece) , Tjallaren (Sweden)
- Plot: When the detective in charge of investigating a series of bank robberies, starts to get too close to the culprits, they set up a blackmail scheme to warn him off. But when the crooks begin to fall out with each other, the police learn the truth.
- IMDB:tt0059312
Underworld Informers Cast · · · ALL
Ken Annakin
Director
Nigel Patrick
Chief Insp. John Edward Johnnoe
Katherine Woodville
Mary Johnnoe
Colin Blakely
(1930–1987)
Charlie Ruskin
Derren Nesbitt
Bertie Hoyle
Harry Andrews
Supt. Alec Bestwick
Roy Kinnear
Shorty
Margaret Whiting
Maisie Barton
Allan Cuthbertson
Smythe
Frank Finlay
Leon Sale
Michael Coles
Ben
Ronald Hines
Geoff Lewis
George Sewell
Fred Hill
Kenneth J. Warren
Lou Waites
Brian Wilde
Lipson
Peter Bowles
Peter The Pole (uncredited)
Donal Donnelly
Tommy The Trotter (uncredited)
Harry Landis
Hicks (uncredited)
Garfield Morgan
Police Inspector (uncredited)
Geoffrey Denton
Police Inspector (uncredited)
Patrick Jordan
Police Inspector (uncredited)
Ray Smith
Police Sergeant (uncredited)
Donald Tandy
Police Sergeant (uncredited)
Martin Wyldeck
Police Officer (uncredited)
Arthur Howell
Police Officer (uncredited)
Michael Segal
Customer at Club (uncredited)