Yesterday's Enemy is a 1959 Hammer Films British war film in MegaScope directed by Val Guest and starring Stanley Baker, Guy Rolfe, Leo McKern and Gordon Jackson set in the Burma Campaign during World War II. It is based on a 1958 BBC teleplay by Peter R. Newman, who turned it into a three-act play in 1960. The TV play was reportedly based on a war crime perpetrated by a British army captain in Burma in 1942. Gordon Jackson repeated his role from the BBC teleplay as Sgt. Ian McKenzie.

Val Guest was an English film director and screenwriter. Beginning as a writer of comedy films, he is best known for his work for Hammer, for whom he directed 14 films, and for his science fiction films. He enjoyed a long career in the film industry from the early 1930s until the early 1980s.