William Henry Kelsey (October 2, 1812 – April 20, 1879) was a U.S. Representative from New York.

He studied law and was admitted to the bar in 1843 and commenced practice in Geneseo, New York.

He voluntarily retired from political life and resumed the practice of law in Geneseo, New York, where he died on April 20, 1879.

His brother was Edwin B. Kelsey, who was a lawyer, businessman, and Wisconsin state legislator.

This article incorporates public domain material from the Biographical Directory of the United States Congress