William or Bill Winter may refer to:
- Bill Winter (American football) (born 1943), American football player
- Bill Winter (British Army officer) (William Arthur Winter, 1913–2004), British soldier
- Bill Winter (linebacker) (born 1940), American football player; played for the New York Giants (1962–1964)
- William Winter (author) (1836–1917), American drama critic and author
- William Winter (chess player) (1898–1955), British chess player
- William Winter (cricketer) (1843–1905), English cricketer
- William F. Winter (1923-2020), American politician; former Governor of Mississippi
- W. Christopher Winter (born 1972), sleep medicine specialist and neurologist
- William H. Winter (1819–1879), American explorer and author
- William J. Winter (born 1930), Roman Catholic auxiliary bishop of Pittsburgh