William Alfred Westropp Foyle (1885-1963) was a British bookseller and businessman who co-founded Foyles bookshop in 1903 with his brother Gilbert Foyle.

William Foyle was one of the leading London booksellers of the 20th century. In 1903 he opened his first bookshop with his brother Gilbert and by the late 1920s the business had grown so rapidly that their bookstore in Charing Cross Road held a stock of four million volumes on over thirty miles of bookshelves,