Horatio Seymour (disambiguation) explained

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