Weldon South Coblin (Chinese: 柯蔚南; pinyin: Kē Wèinán) is a linguist and sinologist. He was a student of Li Fang-Kuei. Early in his career he made many important contributions to Tibetan and Sino-Tibetan linguistics, but since the mid-1990s has worked primarily on alphabetic representations of Chinese. Starting around that time along with Jerry Norman he promoted a new direction in Chinese historical phonology making less use of the Qieyun and other rhyme books, and more use of the traditional comparative method. Coblin is an emeritus professor at the University of Iowa.