Arthur John "Jack" Lohwater (October 20, 1922 - June 10, 1982) was an American mathematician. He obtained a Ph.D. in mathematics at University of Rochester (1951), on the dissertation The Boundary Values of a Class of Analytic Functions, advised by Wladimir Seidel. Later he joined the faculty at University of Michigan and Case Western Reserve University. He was editor of Mathematical Reviews (1962–65). With Norman Steenrod and he established important ties with Russian mathematicians, beginning with a conferences in Moscow (1956, 58) andresulting in a dictionary. Lohwater died after a long battle with lung cancer. He was married to the mathematician Marjorie White Lohwater (1925-2007).