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), English academic administrator and clergyman
- William Lancaster (anthropologist), British social anthropologist studying various Arab tribes and communities
- William Lancaster (cricketer), English cricketer
- William Lancaster (politician), English politician and benefactor
- William H. Lancaster, member of the California State Assembly
- William Edward Lancaster, chief executive of the Royal Zoological Society of South Australia
- Willie Lancaster, Scottish footballer
- Bill Lancaster, American screenwriter
- Bill Lancaster (aviator), British aviator