Thomas Barnett

• Thomas Barnett (musician), American singer and songwriter
• Thomas P. Barnett, American architect and painter
• Thomas P. M. Barnett, American military geostrategist
• Thomas Speakman Barnett, Canadian politician
• Thomas Barnett (Niagara Falls), museum proprietor, collector and innkeeper
• Thomas Barnett (footballer, born 1876), 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), former professional American football player
• Tommy Barnett (pastor), American author and pastor