John C. Calhoun was the 7th vice president of the United States.
John Calhoun may also refer to:
- John Calhoun (diver) (1925–2010), American Olympic diver
- John Calhoun (publisher) (1808–1859), American publisher and politician
- John A. Calhoun (1918–2000), American diplomat
- John B. Calhoun (1917–1995), ethologist noted for his 1947 Norway rat and 1970s mice population dynamic studies
- John C. Calhoun (police officer), Pittsburgh Police Chief in the 1920s
- John Coleman Calhoun (1871–1950), politician in Alberta, Canada
- John C. Calhoun II (1843–1918), American planter and businessman
- John H. Calhoun (1899–1988), NAACP leader and Atlanta City Council member
- John R. Calhoun, merchant and political figure on Prince Edward Island in the 1870s
- John William Calhoun, mathematics professor, University of Texas comptroller and president in the 1930s
- John Calhoun, creator of the 1994 Macintosh game Glider PRO
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