Andrew Sylvester Warner (January 12, 1819 – December 26, 1887) was an American politician from New York.

On October 3, 1861, he married Chloe Monroe (1840–1916), and their son was Wilbert Charles Warner MD (1864–1927).

He fought in the American Civil War attaining the rank of colonel, but contracted typhoid fever and was discharged.

In 1874, he ran as an Independent for Congress in the 24th District, but was defeated by Republican William H. Baker.

He died on December 26, 1887, in Sandy Creek, New York; and was buried at the Woodlawn Cemetery there.