The Rat is a 1937 British drama film directed by Jack Raymond and starring Anton Walbrook, Ruth Chatterton, and René Ray. It is based on the play The Rat by Ivor Novello which had previously been made into a 1925 film The Rat starring Novello. It was made at Denham Studios by Herbert Wilcox Productions.
Infamous Parisian jewel thief Jean Boucheron, known as 'the Rat', attracts the fancy of socialite Zelia de Chaumont, mistress of a South American millionaire. She intends to reform 'the Rat', but he's only interested in relieving her of her pearls.
Kinematograph Weekly reported the film as a "surprise" "turn up" at the British box office in March 1938.