John Barrett may refer to:
- John Barrett (diplomat), United States ambassador to Siam, Argentina, Panama, and Colombia. John Barrett ( November 28 1866 &ndash October 17 1938) was a United States Diplomat and one of the most influential early
- John Barrett (hockey), retired NHL defenseman
- John Barrett (politician) (born 1954), a Scottish MP
- John Barrett (died 1693), Irish colonel in the Williamite war
- John Barrett (reverend), noted Irish Hebrew scholar (1753-1821)
- John Barrett (tennis), the BBC tennis commentator. John David Barrett (born July 1, 1958 in Ottawa Ontario) is a retired Canadian Ice hockey player John Andrew Barrett ( February 11, 1954) Scottish politician is the Liberal Democrat Member of Parliament for Edinburgh West John Barrett (d 1693 was a Colonel and head of the barony of the Cork Barrett family Rev John Barrett ( 1753 &ndash November 15, 1821) of Dublin University, Ireland, was a noted Hebrew scholar
- John Barrett (Western & Southern), President and CEO of Fortune 500 firm Western & Southern Financial Group
- John Cridlan Barrett, English recipient of the Victoria Cross
- John C. A. Barrett (born 1943), the current principal of ACS (International) Singapore
- John G. Barrett, actor
- John George Barrett, an Australian politician
- John W. Barrett, a mathematical physicist
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