Thornett is a surname. Notable people with the surname include:
Alan Thornett (born 1937), British Trotskyist leader Dick Thornett (1940–2011), one of five Australians to have represented their country in three sports Jan Thornett, married name of Jan Andrew (born 1943), Australian butterfly swimmer and Olympic medallist John Thornett (1935–2019), Australian rugby union player Ken Thornett (born 1937), Australian rugby league footballer
See also Thorne (disambiguation) Thorner Thorney (disambiguation) Tornat