Kim Hyun-sub (Korean: 김현섭; Hanja: Kim Hyeonseob, Korean pronunciation: [kim.ɦjʌn.sʌp̚] or [kim] [hjʌn.sʌp̚]; born May 31, 1985) is a male race walker from South Korea. He is the first South Korean person who obtained a medal at IAAF World Athletics Championships.