William Henry Ryan (May 10, 1860 – November 18, 1939) was an American businessman and politician who served one term as a U.S. Representative from New York from 1899 to 1909.

Born in Hopkinton, Massachusetts, Ryan moved to Buffalo, New York, with his parents in 1866, where he attended the local schools.

He resumed the insurance and bonding business in Buffalo, New York, and engaged for a time in banking.

He was interred in Mount Calvary Cemetery, at Pine Hill, near Buffalo, New York.

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