Jack Gallagher may refer to:Jack Gallagher (comedian), American comedian, actor and writer Jack Gallagher (composer), American composer and college professor Jack Gallagher (historian) (1919–1980), British historian Jack Gallagher (oilman) (1916–1998), Canadian oil and gas executive Gentleman Jack Gallagher, British professional wrestler Jack Gallagher, character in And Millions Will Die