Isador Henry Coriat (December 10, 1875, Philadelphia – May 26, 1943, Boston) was an American psychiatrist and neurologist. He was one of the first American psychoanalysts. He was born in Philadelphia in 1875 as the son of Hyram Coriat and Clara née Einstein. He was of Moroccan-Spanish descent on father's side and German on mother's side. He grew up in Boston and attended Tufts Medical School, graduating in 1900.