Joseph Pomeroy Widney, M.D. D.D. LL.D (December 26, 1841 – July 4, 1938), was an American doctor, educator, historian, and religious leader. After the American Civil War led him to medicine, he followed his brothers to California where he received his medical degree. He saw southern California as a "Garden of Eden". In Los Angeles he was a founder of the Los Angeles Medical Society. He was a strong proponent of the new University of Southern California, and became its second president and the founding dean of its school of medicine. The Los Angeles Public Library was one of his major interests.