John Barrett
John Barrett or Johnny Barrett may refer to:
Clergy
- John Barrett , British clergyman who held high office in the Roman Catholic Church
- John Barrett , Irish Anglican priest
- John Barrett , Irish Anglican priest
- John C. A. Barrett, Chairman of the World Methodist Council and educator
Military personnel
- John Barrett , Irish colonel in the Williamite war
- John Barrett , Irish captain in the Royal Navy
- John Cridlan Barrett, English recipient of the Victoria Cross
Politicians
- John Barrett , Australian senator
- John Barrett , American legislator and former mayor of North Adams
- John Barrett , American legislator
- John Barrett , Scottish Liberal Democrat politician and the former Member of Parliament for Edinburgh West
- John Barrett Jr., Citizen Potawatomi Nation chairman
Scholars
- John Barrett, British energy and climate change scientist
- John Barrett , Irish Anglican priest
- John C. Barrett, British archaeologist
- John W. Barrett, British mathematician
- John W. Barrett, British mathematical physicist
Sportpeople
- John Barrett , American football player
- John Barrett , Irish track and field athlete
- John Barrett , Australian rules footballer
- John Barrett , English cricketer
- John Barrett , Canadian NHL defenceman
- John Barrett , American baseball outfielder
- John Barrett , English tennis player and commentator
- John Barrett , Canadian volleyball player
- Johnny Barrett , American football player
- Johnny Barrett , American baseball player
Others
- John Barrett , British actor
- John Barrett , British conservationist, author and broadcaster
- John Barrett , United States ambassador to Siam, Argentina, Panama, and Colombia
- John Barrett, the brand of beauty and hair salons by hairstylist John Barrett
- John Barrett, frontman of the band Bass Drum of Death
- John F. Barrett, CEO of Western & Southern Financial Group