Bill, Billy, Willie, or William Paul may refer to:
Politics
William Paul (MP), British MP for Windsor, 1710–1711
William Paul (attorney) (1885–1977), Alaskan politician and attorney
William Paul (Australian politician) (1846–1947), New South Wales politician
William Paul (British politician) (1884–1958), communist politician and newspaper editor
William Paul (New Zealand politician) (1875–1942), New Zealand politician
William James Paul (1854–1929), Canadian politician
William Sheffield Paul (1832–1902), member of the Queensland Legislative Assembly, Australia
Sports
William Paul (footballer, born 1868) (1868–1932), Scottish footballer
Willie Paul (footballer) (1866–1911), Scottish footballer
Bill Paul (cyclist) (1910–2003), cyclist and tandem rider
William Wayne Paul (1939–1989), American martial artist
Willie Paul (bowls) (born 1944), Scottish international lawn bowler
William Paul (judoka), American who participated in Judo at the 1967 Pan American Games
Billy Paul (gymnast), American artistic gymnast
Other
William Paul (bishop) (1599–1665), bishop of Oxford and dean of Lichfield
William Paul (minister) (1754–1802), minister of the Church of Scotland, Chaplain in Ordinary in Scotland to King George III the United Kingdom
William Paul (Utah architect) (1803–1889)
William Paul (horticulturalist) (1822–1905), British
William Paul (priest) (1678–1716), Church of England clergyman and Jacobite sympathizer, executed for treason
William F. Paul (1850–1928), English businessman in Ipswich, Suffolk
William H. Paul (1844–1911), United States soldier
Billy Paul (1934–2016), American soul singer
William E. Paul (1936–2015), American immunologist
William Paul (died 1773), older brother of John Paul Jones
Billy Paul (fl. 1970s), saxophonist with Wizzo Band