William Carlos Stone

William Carlos Stone (October 9, 1859 – February 23, 1939), called "Uncle Billy" by his friends, of Springfield, Massachusetts, was a philatelist who specialized in the collection of philatelic literature related to revenue stamps and postal stationery.

Stone collected and studied United States revenue stamps, and, at the same time, accumulated a large library consisting mostly of philatelic literature related to revenue stamps. He assisted his fellow philatelist William Reynolds Ricketts in the preparation of Ricketts' famous index of philatelic literature.

Stone helped found the American Philatelic Association, which later became the American Philatelic Society, and he continued to support the organization his entire philatelic career.

Stone was named to the American Philatelic Society Hall of Fame in 1947.

Stone's collection of revenue stamp philatelic literature was sold in 1939 to George Townsend Turner, who later donated it to the Smithsonian Institution where it now resides in the National Postal Museum in Washington, D.C.