William Lancaster

William Lancaster may refer to:

• William de Lancaster I, or William Fitz Gilbert, was a nobleman of the twelfth century in Northwest England
• William Lancaster (Queen's) (1650–1717), English academic administrator and clergyman
• William Lancaster (anthropologist) (1938–2022), British social anthropologist studying various Arab tribes and communities
• William Lancaster (cricketer) (1873–1938), English cricketer
• William Lancaster (politician) (1841–1929), English politician and benefactor
• William H. Lancaster (1931–2000), member of the California State Assembly
• William Edward Lancaster (1909–2003), chief executive of the Royal Zoological Society of South Australia
• Willie Lancaster, Scottish footballer
• Bill Lancaster (1947–1997), American screenwriter
• Bill Lancaster (aviator) (1898–1933), British aviator