William Gillies may refer to:
William Gillies (Australian politician) (1868–1928), Premier of Queensland in 1925 William Gillies (Scottish politician) (1865–1932), co-founder of the National Party of Scotland William Gillies (sport shooter) (1914–1986), Scottish shooter who represented Hong Kong at the Olympics William George Gillies (1898–1973), Scottish landscape and still life painter William S. Gillies (1911–2000), United States artist William King Gillies (1875–1952), Scottish educator and academic author
See also Billy Gillies, Northern Irish disc jockey William Gilly, biologist William Gillis (disambiguation)