Judd Asher Nelson (born November 28, 1959) is an American actor best known for his roles as John Bender in The Breakfast Club, Alec Newbury in St. Elmo's Fire, Hot Rod / Rodimus Prime in The Transformers: The Movie and Transformers: Animated, Ryan Hunt in Billionaire Boys Club, Nick Peretti in New Jack City, Billy Beretti in Empire and Jack Richmond in the television series Suddenly Susan.

He played Harry Longworth in the revival series episode "Something About Harry".