Sun Jun (; born 16 June 1975) is a former world number 1 singles badminton player from China in the late 1990s whose resume includes the World Championship, World Cup, Asian Championship and All England men's singles titles. He was known for his all-round defensive ability as well as his never-say-die attitude on court as exemplified by his famous match with Peter Rasmussen whereby he suffered a severe leg cramp during mid-match but basically carried on to finish an entire set limping on one leg, at one point leading by 10-3 due to intelligent play before succumbing to his opponent.