William, Will, Bill, or Billy Wagner may refer to:
Sports Bill Wagner (baseball) (1894–1951), American baseball catcher Billy Wagner (William Edward Wagner, born 1971), MLB pitcher Bull Wagner (William George Wagner, 1887–1967), pitcher in Major League Baseball Will Wagner (American football) American football player and coach Will Wagner (baseball) (William James Wagner, born 1998), MLB infielder, son of Billy Wagner William Wagner (long snapper) (born 2000), American football long snapper
Others Bill Wagner (software), American software developer Bill Wagner III (1944–2012), Arizona politician George "Billy" Wagner III, suspect in the Pike County shootings Guillermo Wagner Granizo (1923–1995, Guillermo "Bill" Wagner Granizo), American ceramic tile artist Kenny Wagner (William Kenneth Wagner, 1903–1958), Mississippi bootlegger Stanley Wagner (winemaker) (Stanley "Bill" Wagner), early American vintner William Wagner (actor) (1883–1964), American character actor William Wagner (land surveyor) (1820–1901), Polish-born Canadian land surveyor William Wagner (philanthropist) (1796–1885), American philanthropist and natural history museum founder in Philadelphia William Wagner (physician) (1825–1872), German American physician and revolutionary William G. Wagner (1950–2021), Williams College faculty member and former interim president Wolfe Wagner (William Wolfe Wagner, died 1937), Irish Anglican clergyman