Badou Johannes Gabriel Jack (born 31 October 1983) is a Swedish professional boxer. He is a former world champion in two weight classes, having held the WBC super middleweight title from 2015 to 2017 and the WBA light heavyweight title in 2017. As an amateur he represented The Gambia at the 2008 Olympics, reaching the first round of the middleweight bracket.
Jack began his amateur boxing career in 2001 at the age of 18. He held a record of 150 wins and 25 losses. He won Sweden's national championship five years in a row, 2004-2008, 4 times at middleweight and once at light heavyweight. In 2007, Jack was named the boxer of the year by the Swedish Boxing Federation. In his last national championship in 2008 he defeated fellow rising star Erik Skoglund in the finals. He represented Sweden at light-heavyweight before changing to Gambia, where he qualified for the 2008 Games.
At the 2nd AIBA African 2008 Olympic Qualifying Tournament he breezed through the competition to win; the final was a shutout win over DR Congo's Herry Saliku Biembe. Jack qualified for the 2008 Olympics for Gambia in the middleweight division, and was the nation's flag bearer at the Opening Ceremonies. He lost in the first round to India's Vijender Singh.