John Greer may refer to:
- John Greer, character in Person of Interest
- John Greer (sculptor), Canadian sculptor
- John W. Greer, Jr. (1909–1994), Georgia politician
- John Alexander Greer (1802–1855), Texas politician
- Big John Greer (1923–1972), American blues singer
- John Michael Greer, American author
This disambiguation page lists articles about people with the same name.
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