Hezekiél Sello Sepeng (born 30 June 1974), is a South African middle distance runner who won silver in the Olympic 800 metres final in Atlanta 1996 (behind Vebjørn Rodal), the 1998 Commonwealth Games (behind Japheth Kimutai) and the World Championships' final in Seville 1999 (behind Wilson Kipketer). He was banned from competition from May 2005 to May 2007 after a positive doping test for nandrolone.