John Blair Smith Todd | |
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| Born | April 4, 1814 Lexington, Kentucky, U.S. |
| Died | January 5, 1872 (aged 57) Yankton County, Dakota Territory |
| Place of burial | Yankton City Cemetery, Yankton, South Dakota |
| Allegiance | United States of America Union |
| Service | United States Army Union Army |
| Years of service | 1837–1856, 1861–1862 |
| Rank |  Brigadier General |
| Battles / wars | Seminole Wars Mexican–American War -Siege of Veracruz -Battle of Cerro Gordo American Civil War |
| Other work | Delegate from Dakota Territory to the United States House of Representatives |
John Blair Smith Todd (April 4, 1814 – January 5, 1872) was a Delegate from Dakota Territory to the United States House of Representatives and a general in the Union Army during the American Civil War.