Sven Ottke (born 3 June 1967) is a German former professional boxer who competed from 1997 to 2004. He was a unified super-middleweight world champion, having held the IBF title from 1998 to 2004, and the WBA (Super) title from 2003 to 2004. With 21 successful title defences, Ottke was the third European boxer to retire as an undefeated world champion, after Terry Marsh and Michael Loewe; Joe Calzaghe later became the fourth. Ottke defended the title against 20 boxers, a record in the super-middleweight division shared with Joe Calzaghe. As an amateur, Ottke won a bronze medal in the middleweight division at the 1989 World Championships.