Edward Spring Knapp (September 10, 1879 – April 5, 1940), of New York City, was a philatelist known for his remarkable collections of postage stamps and postal history.

However, the rest of the collection was massive and required three auction sessions to be conducted by Parke-Bernet Galleries before all the philatelic material was evaluated and sold.

Material in the collection sold at auction were photographed before sale, and illustrations of 7,822 philatelic items were published in 186 volumes and placed into the library at the Collectors Club of New York.

Another set of three volumes entitled Philatelic Iconography: Being Illustrations of Rare and Unusual Stamps, Covers, and Cancellations Included in the Edward S. Knapp Collections was published in 1941, and it contained material not included in the 186 volumes.

A copy is now located in the National Postal Museum at the Smithsonian Institution in Washington, D.C. Edward Knapp was named to the American Philatelic Society Hall of Fame in 1941.