Judd Asher Nelson (born November 28, 1959) is an American actor. He is best known for his roles as John Bender in The Breakfast Club, Alec Newbary in St. Elmo's Fire, and Jack Richmond in Suddenly Susan.

Nelson was one of the 1980s "Brat Pack", starring in such films as Joel Schumacher's St. Elmo's Fire and John Hughes' The Breakfast Club (which was his most popular role as rebel John Bender), as well as providing the voice of Hot Rod/Rodimus Prime in Transformers: The Movie. He also starred in a film titled Making the Grade and co-starred alongside a young Kevin Costner in the road-trip movie Fandango.