Horatio Seymour (May 31, 1810 – February 12, 1886) was an American politician and lawyer. He was the 18th Governor of New York from 1853 to 1854 and from 1863 to 1864. He was the Democratic Party nominee for president of the United States in the presidential election of 1868, but lost the election to Republican and former Union General of the Union Army Ulysses S. Grant.