John Cowles

John Cowles may refer to:


 * John Cowles Sr. (1898–1983), American newspaper and magazine publisher
 * John Cowles Jr. (1929–2012), American editor and publisher
 * John Cowles (mineralogist), namesake of Cowlesite
 * John Cowles (politician) (fl. 1881), member of the 104th New York State Legislature for Monroe County