Arthur John "Jack" Lohwater (October 20, 1922 - June 10, 1982 in Cleveland) 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 Sydney Gould he established important ties with Russian mathematicians, beginning with a conferences in Moscow (1956, 58) and
resulting in a dictionary.
Lohwater died after long battle with lung cancer.
He was married to the mathematician Marjorie White Lohwater (1925-2007).