John Glasgow Kerr (1824–1901) was an American medical missionary and philanthropist who helped establish the Canton Hospital, also known as the Ophthalmic Hospital, in Canton, China. Kerr was born in Dunkinsville, Ohio and graduated from Jefferson Medical College in Philadelphia. He arrived in Canton in May 1854 with his wife to run the Huiji Dispensary of the Presbyterian Mission and the Canton Hospital (1855); Kerr served as superintendent of the hospital for 45 years. In 1859, Kerr opened Boji (boji meaning spreading benevolence) Hospital, located in Zhengsha Street in a southern suburb of Canton. In 1860, Kerr opened of the second dispensary in Foshan, later becoming the largest hospital in the city. In 1899, Kerr opened the first mental hospital in China.