Henry William Cleaveland (1827 – May 29, 1919)[1] was an American architect based in New York, New York, and then San Francisco, California, and Portland, Oregon. He was one of the founding members of the American Institute of Architects, and several of his works have been listed on the National Register of Historic Places. His works include Ralston Hall, a National Historic Landmark in the San Francisco Bay Area, the original Palace Hotel in San Francisco, and the Bidwell Mansion in Chico, California.