William Reynolds Ricketts (July 29, 1869 – October 14, 1956), of Forty Fort, Pennsylvania, was a philatelist who created the largest index of philatelic literature available during his lifetime.

Indexes created by Ricketts were published, usually in small segments, in philatelic journals.

Ricketts was a member of the Collectors Club of New York to which he donated a large portion of the foreign language philatelic literature of his library.

Ricketts signed the Roll of Distinguished Philatelists in 1921 and was named to the American Philatelic Society Hall of Fame in 1988.

[1] The largest portion of his library was purchased by George Townsend Turner who, in turn, donated most of it to the Smithsonian Institution, where it is now located in the National Postal Museum at Washington, D.C.