49th Parallel is a 1941 British war drama film. It was the third film made by the British filmmaking team of Michael Powell and Emeric Pressburger. It was released in the United States as The Invaders. The British Ministry of Information approached Michael Powell to make a propaganda film for them, suggesting he make "a film about mine-sweeping". Instead, Powell decided to make a film to help sway opinion in the then-neutral United States. Said Powell, "I hoped it might scare the pants off the Americans" and thus bring them into the war. Screenwriter Emeric Pressburger remarked, "Goebbels considered himself an expert on propaganda, but I thought I'd show him a thing or two". Powell persuaded the British and Canadian governments and started location filming in 1940, but by the time the film appeared, in March 1942, the United States, which had been trying to stay out of the war in Europe, had been drawn into taking sides against Germany after being attacked three months earlier.

The British film-making partnership of Michael Powell (1905–1990) and Emeric Pressburger (1902–1988)—together often known as The Archers, the name of their production company—made a series of influential films in the 1940s and 1950s. Their collaborations—24 films between 1939 and 1972—were mainly derived from original stories by Pressburger with the script written by both Pressburger and Powell. Powell did most of the directing while Pressburger did most of the work of the producer and also assisted with the editing, especially the way the music was used. Unusually, the pair shared a writer-director-producer credit for most of their films. The best-known of these are The Life and Death of Colonel Blimp (1943), A Canterbury Tale (1944), I Know Where I'm Going! (1945), A Matter of Life and Death (1946), Black Narcissus (1947), The Red Shoes (1948), and The Tales of Hoffmann (1951).