John Ancrum Winslow | |
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| Born | November 19, 1811 Wilmington, North Carolina, U.S. |
| Died | September 29, 1873 (aged 61) Boston, Massachusetts, U.S. |
| Buried | Forest Hills Cemetery, Boston |
| Allegiance | United States of America |
| Service/ |  United States Navy |
| Years of service | 1827–1873 |
| Rank |  Rear admiral |
| Commands | |
| Battles/wars | Mexican–American War |
John Ancrum Winslow (19 November 1811 – 29 September 1873) was an officer in the United States Navy during the Mexican–American War and the American Civil War. He was in command of the steam sloop of war USS Kearsarge during her historic 1864 action off Cherbourg, France, with the Confederate sea raider CSS Alabama.