William Wagner

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