John Costanza (born August 14, 1943, in Dover, New Jersey) is an American comic book artist and letterer.
The bulk of Costanza's art assignments have been for anthropomorphic animal comics and children-oriented material.
Costanza began his career in 1965, working as Joe Kubert's assistant on the syndicated newspaper strip Tales of the Green Berets.
He would soon become one of the company's premier letterers, working on flagship titles such as Fantastic Four and The Amazing Spider-Man, and lettering special projects such as the Stan Lee/Jack Kirby Silver Surfer graphic novel, Silver Surfer: The Ultimate Cosmic Experience, published by Fireside Books in 1978.
For Marvel's Star Comics line in the 1980s, Costanza drew such series as Heathcliff, The Get Along Gang, and The Hugga Bunch.