Gillett is a surname. Notable people with the surname include:
Aden Gillett (born 1958), British actorAlan Gillett (disambiguation)Amy Gillett (1976–2005), Australian track cyclist and rowerBurt Gillett (1891–1971), American director of animated filmsCharlie Gillett (1942–2010), British radio presenter, musicologist and writerDave Gillett (born 1951), Scottish retired footballerEmma Gillett (1852–1927), American lawyer and women's rights activistFrederick H. Gillett (1851–1935), former US Speaker of the House, US Representative and US Senator from MassachusettsGeorge Gillett (disambiguation)Sir Harold Gillett, 1st Baronet (1890–1976), Lord Mayor of LondonJames B. Gillett (1856–1937) Texas RangerJames Gillett (1860–1937), Republican politician and 22nd Governor of California from 1907 to 1911Jarred Gillett (born 1986), Australian football (soccer) refereeGeorge N. Gillett, Jr. (born 1938), American businessman, owner of various sports teamsMark Gillett, British software engineer and executiveMary Gillett (born 1958), Australian former politicianMatt Gillett (born 1988), Australian Rugby League playerMatthew Gillett (born 1983), Australian soccer refereeSir Michael Cavenagh Gillett (1907–1971), British ambassadorMichael Gillett (born 1973), Australian former rugby league playerNicholas Gillett (disambiguation)Sir Robin Gillett (1925–2009), British merchant navy captain, Lord Mayor of LondonSarah Gillett (born 1956), British ambassadorSimon Gillett (born 1985), English footballer