Jack Katz (born 1927) is an American comic book artist and writer, painter and art teacher known for his graphic novel The First Kingdom, a 24-issue epic he began during the era of underground comix.
Influenced by such illustrative comic-strip artists as Hal Foster and Alex Raymond, Katz attended the School of Industrial Art in New York City. He began working for comic-book publishers in the 1940s, during the period fans and historians call the Golden Age of Comic Books. Though continuing to work in comics through the 1950s, his slow pace and highly detailed, idiosyncratic art style prompted him to leave that field for 14 years. Circa 1969, he returned to mainstream color comics as well as to black-and-white horror-comics magazines, and after a move to California embarked upon The First Kingdom, a serialized work that later became considered a precursor to, or an early form of, the graphic novel. He completed it in 1986, and went on to write and draw further works in that vein, and to teach art.