Joseph William Calzaghe, CBE (/kælˈzæɡi/ kal-ZAH-gee; born 23 March 1972) is a Welsh former professional boxer who competed from 1993 to 2008. He is a two-weight world champion, having held the unified WBA (Super), WBC, IBF, WBO, Ring magazine and lineal super-middleweight titles, as well as the Ring light-heavyweight title. Calzaghe is the longest-reigning super-middleweight world champion in boxing history, having held the WBO title for over 10 years and making 21 successful defences before moving up to light-heavyweight. As his super-middleweight and light-heavyweight reigns overlapped, he retired with the longest continual time as world champion of any active fighter.
Between 2006 and 2008, Calzaghe was rated by The Ring as one of the world's top ten boxers, pound for pound, reaching a peak ranking of third in January 2009. He retired in February 2009 with an undefeated record, and as a reigning world champion.