Surname
- Brett Barnett, director and co-writer of webseries Shadazzle
- Charlene Barnett (1928-1979), All-American Girls Professional Baseball League player
- Charlie Barnett (disambiguation)
- Colin Barnett (born 1950), the Premier of Western Australia
- Correlli Barnett (born 1927), English military historian
- Denis Barnett (1906 - 1992), British air marshal
- Errol Barnett (born 1983), American news anchor and correspondent
- Frank Barnett, 49th Governor of American Samoa
- Guy Barnett (born 1962), Australian politician
- Guy Barnett (1928–1986), British politician
- James Barnett (disambiguation)
- Joel Barnett, Baron Barnett (born 1923), British politician
- Josh Barnett (born 1977), American heavyweight mixed martial arts fighter
- Lincoln Barnett, (1909–1979), American editor and writer
- Louis Barnett (born 1991), British chocolatier
- Nick Barnett (born 1981), American professional football player
- Randy Barnett born 1952), American libertarian legal theorist
- Ross Barnett (1898–1987), 56th Governor of Mississippi
- Richard Barnett (disambiguation)
- Samuel Augustus Barnett (1844–1913), an English clergyman and reformer
- Samuel Jackson Barnett (1873–1956), American physicist, discoverer of the Barnett effect
- Samuel Barnett (actor) (born 1980), English actor
- Steven Barnett (born 1943), American water polo player
- Steven Barnett (born 1979), Australian diver
- Thomas P.M. Barnett (born 1962), American military geostrategist
- Thomas Speakman Barnett 1909–2003), British Columbia Politician
- Tom Barnett (American football) (born 1937), American football player in the National Football League
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