Joseph William Calzaghe, CBE (Order of the British Empire) (born 23 March 1972) is a retired Welsh (Welsh People) professional boxer. He was rated by Ring (The Ring (magazine)) magazine as pound for pound one of the top 10 boxers in the world (Ring Magazine pound for pound). He retired in February 2009 with an undefeated record, becoming only the fourth European boxer, after Terry Marsh (Terry Marsh (boxer)), Michael Loewe (Michael Loewe (boxer)) and Sven Ottke, to retire as an undefeated world champion. After his retirement, Ricky Hatton described him as "the best British fighter weve ever had".

Calzaghe is sometimes referred to as the "Pride of Wales", or the "Italian Dragon" in reference to his mixed heritage (the dragon being both a Welsh emblem (Welsh Dragon) and a Sardinian myth). He is the former WBO (World Boxing Organization), WBA (World Boxing Association), WBC (World Boxing Council), IBF (International Boxing Federation), The Ring Magazine and British (British Boxing Board of Control) super middleweight champion.

Calzaghe is the longest-reigning world champion in recent years, having held the WBO super middleweight title for over ten years until he relinquished the title to concentrate on fighting at 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. He is part of the Team Calzaghe based at the Newbridge boxing club.

In 2007, Calzaghe became BBC Sports Personality of the Year, by gaining 28.19% of the public vote. This made Calzaghe the first Welsh winner of this award since show jumper (show jumping) David Broome in 1960. He was also awarded the Young Boxer of the Year Award in 1995.

Calzaghe was the first Ring Magazine Super Middleweight Champion after his impressive win against undefeated American Jeff Lacy, He also became Ring Magazine Champion in his second weight division after beating future hall of famer Bernard Hopkins for the Light Heavyweight Title. This made him a two weight world champion.

Calzaghe had some big wins against former Super Middleweight world champions like WBO Champion Chris Eubank, WBC Champions Robin Reid and Richie Woodhall, IBF Champions Jeff Lacy and Charles Brewer, WBA Champion Byron Mitchell, Current IBO Champion Sakio Bika. He beat the then champion Mikkel Kessler for the WBA/WBC Titles. In 2008, he had wins over former WBA/WBO/WBC/IBF/RING Middleweight and RING Light Heavyweight Champion Bernard Hopkins, and over Roy Jones Jr who has held titles at middleweight, super middle, light heavy and even heavyweight.

On 28 March 2010, Calzaghe was exposed by the News of the Worlds fake sheik Mazher Mahmood for taking cocaine. He admitted he had a problem with the drug and apologised to his family and fans saying that he would be seeking help with his problem.