William Gillis

William Gillis may refer to:


 * Willie Gillis, Norman Rockwell's fictional character
 * Willie Gillis, a television character in The Rookies
 * Bill Gillis (1936–2009), Canadian politician
 * William Gillis (businessman) (1788–1869), American businessman and one of the 14 original founders of Kansas City, Missouri
 * William Gillis (politician) (1859–1929), British Member of Parliament for Penistone