John Greer

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
• John Allen Greer (1874-1941), Tennessee politician
• Big John Greer (1923–1972), American blues singer
• John Michael Greer, American author