Thomas Barnett may refer to:
- Thomas Barnett (musician) (born 1973), American singer and songwriter
- Thomas P. Barnett (1870âÂÂ1929), American architect and painter
- Thomas P. M. Barnett (born 1962), American military geostrategist
- Thomas Speakman Barnett (1909âÂÂ2003), Canadian politician
- Thomas Barnett (Niagara Falls) (1799âÂÂ1890), museum proprietor, collector and innkeeper
- Thomas Barnett (footballer, born 1876) (1876âÂÂ?), English footballer
- Thomas Barnett (footballer, born 1908), English footballer for Watford
- Thomas Barnett (footballer, born 1936), English footballer for Crystal Palace
- Tom Barnett (American football) (born 1937), former professional American football player
- Tommy Barnett (pastor), American author and pastor