Eugene N. Costales (August 19, 1894 – November 2, 1984), of New York City, was a noted stamp dealer, auctioneer, and expert on authenticity of rare stamps and antiquities.
Among the auction items he sold were philatelic material from famous collections, such as those of Col. Edward Howland Robinson Green, Henry B.
At the American Philatelic Association he served as an expert on the authenticity of rare stamps and postal history items.
He was also an active member of the American Stamp Dealers Association (ASDA).
Costales donated a portion of his philatelic library to the Smithsonian Institution in Washington, D.C.