William Wagner may refer to: William Wagner (land surveyor) (1820–1901), Polish-born Canadian land surveyor William Wagner (actor) (1883–1964), American character actor William Wagner (philanthropist) (1796–1885), American philanthropist and natural history museum founder in Philadelphia William Wagner (physician), German American physician and revolutionary Kenny Wagner (William Kenneth Wagner, 1903–1958), Mississippi bootlegger William G. Wagner, Williams College faculty member and former interim president Bull Wagner (William George Wagner, 1887–1967), pitcher in Major League Baseball Wolfe Wagner (William Wolfe Wagner, died 1937), Irish Anglican clergyman Bill Wagner (1894–1951), American baseball catcher Bill Wagner (software), American software developer Bill Wagner III, Arizona politician Stanley Wagner (winemaker) (Stanley "Bill" Wagner), early American vintner Guillermo Wagner Granizo (Guillermo "Bill" Wagner Granizo), American ceramic tile artist Billy Wagner (William Edward Wagner, born 1971), MLB pitcher