Joel Casamayor Johnson (born July 12, 1971) is a Cuban American former professional boxer who competed from 1996 to 2011.
He held world championships in two weight classes, including the WBA super featherweight title from 2000 to 2002; and the WBC, Ring magazine and lineal lightweight titles between 2006 and 2008.
As an amateur, Casamayor won a gold medal in the bantamweight division at the 1992 Olympics, after which he defected to the United States on the eve of the 1996 Olympics.