Horatio Seymour | |
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| United States Senator from Vermont | |
| In office March 4, 1821 – March 3, 1833 | |
| Preceded by | Isaac Tichenor |
| Succeeded by | Benjamin Swift |
| Probate Judge of Addison County, Vermont | |
| In office 1847–1856 | |
| Preceded by | Silas H. Jennison |
| Succeeded by | Calvin G. Tilden |
| State's Attorney of Addison County, Vermont | |
| In office 1815–1818 | |
| Preceded by | David Edmond |
| Succeeded by | David Edmond |
| In office 1810–1813 | |
| Preceded by | David Edmond |
| Succeeded by | David Edmond |
| Member of the Vermont Governor's Council | |
| In office 1809–1814 | |
| Personal details | |
| Born | May 31, 1778 Litchfield, Connecticut, U.S. |
| Died | November 21, 1857 (aged 79) Middlebury, Vermont, U.S. |
| Political party | Democratic-Republican National Republican Whig |
| Spouse | Lucy Case Seymour |
| Children | 6 (including Horatio Seymour Jr.) |
| Education | Yale College Litchfield Law School |
| Profession | Attorney |
| Signature | &sq=&lang=&file=File:Signature_of_Horatio_Seymour_(1778%E2%80%931857).png){kind=small} |
Horatio Seymour (May 31, 1778 – November 21, 1857) was a United States senator from Vermont. He was the uncle of Origen S. Seymour and the great-uncle of Origen's son Edward W. Seymour.
Horatio Seymour's brother Henry became a resident of Utica, New York and was the father of Horatio Seymour, who served as Governor of New York, and of Julia Catherine Seymour, the wife of Senator Roscoe Conkling.