Horatio Seymour (1810–1886) was Governor of New York.
Horatio Seymour may also refer to:
- Horatio Seymour (Vermont politician) (1778–1857), U.S. Senator from Vermont
- Horatio Seymour (Erie County, NY) (1813–1872), New York assemblyman
- Horatio Seymour, Jr. (1844–1907), New York State Engineer
This disambiguation page lists articles about people with the same name.
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