Ko Reibun (; born September 24, 1981, in Hebei), né Nie Yuncong (), is a professional Go player.
Rin became a professional in 1997. He is the son of one of the greatest Chinese players, Nie Weiping 9 dan, and his mother is Kong Xiangming 8 dan. He moved to Japan to study under Yasuro Kikuchi. He is a Nihon Ki-in pro taking part in tournaments.
He is now a naturalised Japanese, and has a Japanese wife Kobayashi Sayaka, daughter of Kobayashi Satoru. He is currently 7 dan.