William or Liam or Bill Ahern may refer to: Bill Ahern (footballer, born 1865) (1865–1938), Australian rules footballer for Carlton Bill Ahern (footballer, born 1874) (1874–1920), Australian rules footballer for St Kilda Liam Ahern (1916–1974), also known as William Ahern, Irish Fianna Fáil politician William Ahern (Medal of Honor) (1861–1916), Irish-born American sailor Will Ahern (1896–1983), American vaudeville entertainer
See also William Ahearn (1858–1919), baseball player William Ahearn (born 1946), astronomy benefactor after whom the asteroid 25943 Billahearn is named