| John Flournoy Henry | |
| Birth Date: | 17 January 1793 |
| Birth Place: | Scott County, Kentucky, U.S. |
| Death Place: | Burlington, Iowa, U.S. |
| Resting Place: | Aspen Grove Cemetery Burlington, Iowa, U.S. |
| State1: | Kentucky |
| District1: | 12th |
| Term Start1: | December 11, 1826 |
| Term End1: | March 3, 1827 |
| Preceded1: | Robert P. Henry |
| Succeeded1: | Chittenden Lyon |
| Party: | Jackson Republican |
| Education: | Georgetown Academy College of Physicians and Surgeons |
| Spouse: | Mary Wilson Duke Henry Lucy Stringer Ridgely Henry |
| Children: | 4 |
| Allegiance: |  United States |
| Branch: | Kentucky militia |
| Serviceyears: | 1812–1813 |
| Rank: | Surgeon's mate |
| Battles: | War of 1812 |
John Flournoy Henry (January 17, 1793 – November 12, 1873) was a U.S. Representative from Kentucky.
Born at Scott County, Kentucky, Henry attended Georgetown Academy, Kentucky, and Jefferson Medical College, Philadelphia, Pennsylvania.He graduated from the College of Physicians and Surgeons in 1817.He served at Fort Meigs in 1813 as surgeon's mate of Kentucky troops.He engaged in agricultural pursuits and the practice of medicine. He owned slaves.
Henry was elected as an Adams candidate to the Nineteenth Congress to fill the vacancy caused by the death of his brother Robert P. Henry and served from December 11, 1826, to March 3, 1827.He was an unsuccessful candidate for reelection in 1827 to the Twentieth Congress.Professor in the Medical College of Ohio at Cincinnati in 1831.He moved to Bloomington, Illinois, in 1834 and to Burlington, Iowa, in 1845 and resumed the practice of medicine.He died in Burlington, Iowa, November 12, 1873.He was interred in Aspen Grove Cemetery.