William Mayer

William or Bill Mayer may refer to:


 * Bill Mayer (born 1951), American illustrator
 * William Mayer (composer) (1925–2017), American composer
 * William A. Mayer (f. 1956–1959), American polo player
 * William Daniel Mayer (born 1941), former member of the Maryland House of Delegates
 * William E. Mayer, investment banker and former owner of the Hartford Colonials
 * William V. Mayer (1920–1989), American biologist and educator