Bartemius "Barty" Crouch, Jr. is one of Lord Voldemort's most loyal followers and a major antagonist in J.K.Rowling's Wizarding World. He is the main antagonist of the fourth Harry Potter book, The Goblet of Fire. He orchestrated the events of the book, ensuring Harry is one of the champions of Hogwarts to lure him to the Riddle family cemetery and use his blood to bring Lord Voldemort back to life, posing as Alastor Moody.
Barty Crouch Jr. was portrayed by David Tennent in the film adaptation of Harry Potter and the Goblet of Fire.