Roy Levesta Jones Jr. (born January 16, 1969) is an American professional boxer, boxing commentator, boxing trainer, rapper, and actor who holds dual American and Russian citizenship. He has won numerous world titles in the middleweight, super middleweight, light heavyweight, and heavyweight divisions, and is the only boxer in history to start his professional career as a light middleweight and go on to win a heavyweight title. As an amateur he represented the United States at the 1988 Summer Olympics, winning a silver medal in the light middleweight division.

Jones, who is considered by many to be one of the best boxers of all time, pound for pound, left his mark in the sport's history when he won the WBA heavyweight title in 2003, becoming the first former middleweight champion to win a heavyweight title in 106 years. He also became the undisputed light heavyweight champion in 1999, by unifying the WBA, WBC, and IBF titles.

The Boxing Writers Association of America (BWAA) named Jones as the "Fighter of the Decade" for the 1990s. He was also named Fighter of the Year for 2003 by the World Boxing Hall of Fame.

During his prime, Jones was known for possessing exceptional hand speed, athleticism, movement and reflexes.