Matthew Nicholas Biondi (born October 8, 1965) is an American former competition swimmer, eleven-time Olympic medalist, and former world record-holder in five events.
Biondi competed in the Summer Olympic Games in 1984, 1988 and 1992, winning a total of eleven medals (eight gold, two silver and one bronze). During his career, he set three individual world records in the 50-meter freestyle and four in the 100-meter freestyle.
At the 1988 Olympic Games in Seoul, Biondi won five gold medals, setting world records in the 50-meter freestyle and three relay events.
Biondi is a member of the International Swimming Hall of Fame and the United States Olympic Hall of Fame.