John Kerr Tiffany (February 9, 1843 – March 3, 1897), of St. Louis, Missouri, was one of the earliest American philatelists and was regarded in an 1890 poll of philatelists as the second most important person in philately, second only to the famous John Walter Scott.

He continued his work in identifying and cataloging philatelic literature and, in 1889, he published The Stamp Collector's Library Companion(Part 1) and an addenda in 1890.

When Tiffany died in 1897, his philatelic library was the largest in the world, and it was purchased intact by James L. Lindsay, the Earl of Crawford.

Tiffany published the first comprehensive listing of United States postage stamps, entitled Les Timbres des Etats-Unis d'Amerique.

It was printed in three parts in 1883, and he later expanded it in 1887 as History of the Postage Stamps of the United States of America.