Prince Seeiso Bereng Seeiso of Lesotho, Principal Chief of Matsieng (born 16 April 1966) is the younger brother of Lesotho's King Letsie III, and son of the Southern African country's late King Moshoeshoe II (1938–1996) and the late Queen 'Mamohato Bereng Seeiso (1941–2003).