J. P. Carnahan | |
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| Born | Jacob Preston Carnahan September 22, 1832 Canehill, Arkansas, United States |
| Died | July 16, 1912 (aged 79) Prairie Grove, Arkansas, United States |
| Alma mater | Cumberland University |
| Occupation(s) | Confederate States Army captain, professor, Populist politician |
| Spouse | Susan Amelia Crawford Carnahan |
| Children | 5 |
Jacob Preston Carnahan (September 22, 1832 – July 16, 1912) was an American Confederate officer, a professor of mathematics, and Populist politician in Arkansas. He ran for governor.