John Collier may refer to:

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  • John Howell Collier (1898–1980), U.S. Army general
  • John W. Collier (1929–1950), U.S. Army soldier and Medal of Honor recipient
  • John G. Collier (1935–1995), British chemical engineer and administrator
  • John Collier (sociologist) (1884–1968), American social reformer, sociologist, writer and Native American advocate
  • John Collier Jr. (1913–1992), American anthropologist, son of the sociologist, and photographer working for the Farm Security Administration or Office of War Information
  • R. John Collier, American microbiologist and biochemist

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