Meet Mr. Callaghan is a 1954 British crime drama film directed by Charles Saunders and starring Derrick De Marney. Based on the 1938 novel The Urgent Hangman by Peter Cheyney, which Cheyney had then turned into a play. Co-producer and star Derrick de Marney had directed the stage version of Meet Mr. Callaghan at the Garrick Theatre in 1952, which starred Derrick's brother Terence as Cheyney's private eye Slim Callaghan. Derrick played this role in the film. The play was notable for the theme music and score by Eric Spear which became a best-selling record for Les Paul.