William Montgomery may refer to:
- William Montgomery (Pennsylvania soldier) (1736–1816), American judge, U.S. Congressman for Pennsylvania
- William Montgomery (North Carolina politician) (1789–1844), American physician, U.S. Congressman for North Carolina
- William Montgomery (congressman) (1818–1870), U.S. Congressman from Pennsylvania
- William Montgomery (New Zealand politician) (1821–1914), New Zealand MP, Minister of Education
- William Montgomery Jr. (1866–1958), New Zealand MP
- William Montgomery (cryptographer) (fl. 1918), British cryptographer in World War I
- William Bell Montgomery (1829–1904), American farmer, businessman, and editor
- Will Montgomery (born 1983), American football player
- Will Montgomery (rugby union), English rugby union player
- Bill Montgomery (quarterback) (born 1949), American football player
- Bill Montgomery (halfback) (1923–2003), American football player
- Bill Montgomery (cricketer) (1878–1952), English cricketer
- Bill Montgomery (footballer, born 1885) (1885–1953), Scottish footballer
- Bill Montgomery (Australian footballer) (1915–1988), Australian rules footballer for North Melbourne
- Bill Montgomery (Arizona politician) (born 1967), justice of the Arizona Supreme Court and former Maricopa County Attorney
- Billy Montgomery (born 1937), American educator and politician
- William Dale Montgomery (born 1945), American diplomat
- William Allen Montgomery (1829–1905), American lawyer, planter and Baptist minister
- William Fetherstone Montgomery (1797–1859), Irish obstetrician
- William Reading Montgomery (1801–1871), Union Army general in American Civil War
- William Watts Montgomery (1827–1897), justice of the Supreme Court of Georgia