William McCallum may refer to:
William George MacCallum (1874–1944), Canadian-American physician and pathologist Willie McCallum (footballer) (born 1942), Scottish former footballer William G. McCallum (born 1956), a retired University Distinguished Professor of Mathematics at the University of Arizona William McCallum House, an Italianate Style house in Valparaiso, Indiana Bill McCallum (1911–unknown), Australian rules footballer
See also Willie McCallum, Scottish Highland bagpipe player