William Henry Baker (January 17, 1827 – November 25, 1911) was an American politician and a U.S. Representative from New York.

Born in Lenox, New York, Baker moved with his parents to Oswego County in 1829 and attended the common schools, then Red Creek and Mexico Academies.

Elected as a Republican to the Forty-fourth and Forty-fifth Congresses, Baker served as U.S. Representative for the twenty-fourth district of New York from March 4, 1875, to March 3, 1879.

[1] Declining to be a candidate for renomination in 1878, Baker resumed his practice and was a delegate to the State constitutional conventions in 1884 and 1894.

[2] Baker died in Constantia, New York, on November 25, 1911 (age 84 years, 312 days).