William Lucas, Bill, or Billy Lucas may refer to:
Law and politics William Lucas (Virginia politician) (1800–1877), American politician and lawyer from Virginia William V. Lucas (1835–1921), American politician representing South Dakota William Thomas Lucas (1875–1973), Canadian farmer and federal politician William Brooks Lucas (1891–1970), American politician and lawyer from Mississippi William Lucas (Michigan politician) (1928–2022), American politician in Michigan Bill Lucas (Missouri politician), American politician in Missouri
Sports Bill Lucas (rugby league) (fl. 1910s-1920s), Australian rugby league player Bill Lucas (runner) (1917–2018), British long-distance runner Billy Lucas (1918–1998), Welsh footballer Bill Lucas (baseball) (1936–1979), American baseball executive Bill Lucas (rower) (born 1987), British rower
Others William Lucas (bishop) (1883–1945), English Anglican bishop William R. Lucas (1922–2025), American space engineer and NASA executive Bill Lucas (architect) (1924–2001), Australian architect William Lucas (actor) (1925–2016), British film and television actor Bill Lucas (academic) (born 1956), English social entrepreneur and researcher