Jack Robert Culcay-Keth (born 26 September 1985 in Ambato, Ecuador) is an Ecuador-born German professional boxer. As an amateur he represented Germany, fighting at the 2008 Summer Olympics in the welterweight division, and winning a silver medal at the 2008 European Championships and gold at the 2009 World Championships. He held the WBA interim light-middleweight title between 2015 and 2017.