The Liquidator is a 1965 British thriller film directed by Jack Cardiff and starring Rod Taylor, Trevor Howard, and Jill St.

In 1944 during World War II, American tank corps Sergeant "Boysie" Oakes stumbles and unwittingly shoots and kills two men attempting to assassinate British Intelligence Major Mostyn in Paris.

Twenty-one years later, Mostyn (now a colonel in British Intelligence) and his boss are in trouble due to a series of embarrassing security disasters.

To save his job, the chief orders Mostyn to hire an assassin to illegally eliminate security leaks without official authorisation.

Mostyn recruits Boysie, now living in England, into the Secret Service without first telling him what his employment will entail, luring him in with a lavish apartment and a fancy car.

Unable to resign and not a killer himself, Boysie secretly hires a freelance professional assassin named Griffin to do the dirty work.

He is to stage a fake assassination attempt on the Duke of Edinburgh, when he visits a Royal Air Force base, to test the security.

Rod Taylor looks a little flabby as the reluctant assassin, but he does manage to make the character appealing, and Trevor Howard wickedly proves how dialogue can be made to sound better than it is; and there is an amusing interlude in the shape of Akim Tamiroff as a blundering torturer doing his best to look villainous.