Haiden Deegan (born January 10, 2006) is an American professional motorcycle racer who has become a dominant force in AMA Supercross and Motocross, holding two titles each in the 250cc SMX, AMA Motocross, and AMA Supercross 250cc West classes. After making his professional debut in 2023, he earned the 250SX Rookie of the Year award and captured his first overall motocross win at RedBud National, finishing fourth overall that season. In 2024, he clinched the 250cc AMA Pro Motocross Championship with five overall wins and finished second in the 250SX East Supercross series. He continued his success in 2025 by winning the 250SX West Region title, and he has also secured back-to-back 250 SMX World Championships in 2023 and 2024. Off the track, he comes from a prominent racing family as the son of freestyle motocross legend Brian Deegan and brother of NASCAR driver Hailie Deegan. However, in 2025, Deegan faced legal trouble when he was arrested in Walton County, Florida, on charges related to alleged street racing.