Thomas Hearns is an American former professional boxer.  Hearns had an amateur record of 155–8. In 1977, he won the National Amateur Athletic Union Light Welterweight Championship, defeating Bobby Joe Young of Steubenville, Ohio, in the finals. He also won the 1977 National Golden Gloves Light Welterweight Championship.

Hearns competed from 1977 to 2006.  Hearns' tall, slender build and oversized arms and shoulders allowed him to move up over fifty pounds in his career and become the first boxer in history to win world titles in five weight divisions: welterweight, light middleweight, middleweight, super middleweight and light heavyweight. Hearns was named Fighter of the Year by The Ring magazine and the Boxing Writers Association of America in 1980 and 1984; the latter following his knockout of Roberto Durán. Hearns was known as a devastating puncher throughout his career, even at cruiserweight, despite having climbed up five weight classes. He is ranked number 18 on The Ring's list of 100 greatest punchers of all time. He currently ranks #92 in BoxRec ranking of the greatest pound for pound boxers of all time.

Hearns's family is a fixture on the Detroit sports scene. His mother, Lois Hearns, is a fight promoter. Their company, Hearns Entertainment, has promoted many cards, including the Mike Tyson–Andrew Golota bout in 2000. On June 10, 2012, Hearns was inducted into the International Boxing Hall of Fame.