John Calhoun may refer to:
- John C. Calhoun, seventh Vice President of the United States, U.S. Senator
- John Calhoun (software developer), American computer programmer
- John B. Calhoun, psychologist noted for his 1947 Norway rat and 1970s mice population dynamic studies
- John A. Calhoun, American diplomat
- John C. Calhoun (Pittsburgh), Pittsburgh Police Chief
- John Coleman Calhoun, politician in Alberta, Canada
- John William Calhoun, mathematics professor, University of Texas comptroller and president
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