Yuet Wai Kan FRS (Chinese: 簡悅威; Jyutping: Gaan2 Jyut6 Wai1; born June 11, 1936), is a Chinese-American geneticist and hematologist. He is the current Louis K. Diamond Chair in Hematology and a Professor Emeritus at the University of California, San Francisco. He is a former president of the American Society of Hematology.