Amazing-Man (John Aman) is a comic book superhero whose adventures were published by Centaur Publications during the 1930s to 1940s in the Golden Age of Comic Books. Historians credit his creation variously to writer-artist Bill Everett or to Everett together with Centaur art director Lloyd Jacquet. Amazing-Man first appeared in Amazing-Man Comics #5 (Sept. 1939)—there were no issues numbered #1–4.

During the Golden Age of Comic Books, Centaur Publications produced Amazing-Man's eponymous series, Amazing-Man Comics, which ran from issues #5–26 (Sept. 1939 – Feb. 1942). Amazing-Man was the second superhero to have a comic book named after him, after Superman. In 1941, Centaur also included Amazing-Man in their war comic, Stars and Stripes Comics #2–6 (June–Dec. 1941). The book was cancelled in 1942 when the company went out of business.

The character influenced the creation and origin of Charlton Comics' 1960s superhero Peter Cannon, Thunderbolt, as well as Marvel Comics' Iron Fist character in the 1970s, and DC Comics' hero of the same name.

In a letter from Everett's wife, Grace, she revealed that the character was created in response to the National Periodical character Superman. "I’m going to spend all day tomorrow at the Public Library, doing some research work for Bill. He has a new character, for a strip which [Lloyd] Jaquet wants him to do in competition with the new one now being syndicated – called the “Superman’ I think. We’ve wracked our brains for a new kind of character; and all I can think of now is to back over some old folk tales, foreign ones if necessary, and try to find some unusual character around which we can build an unusual story for these modern times."

John Aman is an orphan from the West, chosen for his "superb physical structure" to be raised by benevolent monks in Tibet for the first 25 years of his life. Each member of The Council of Seven, as the monks are known, trained him to a superhuman degree of physical and mental ability, while also giving him the ability via a chemical solution to disappear into a cloud of green mist, earning him the secondary title of the Green Mist. His new powers include super-strength, invulnerability and speed, as well as healing and telekinesis.

After receiving his final tests, he is sent into the world to use his skills and abilities to do good. Opposing Aman, as he was often known, is his nemesis the Great Question, a disgruntled member of the Council of Seven. Aman's sidekick is Tommy, the Amazing Kid, and he's also aided by "ace girl crime investigator" Zona Henderson.

In the 1990s, Malibu Comics used the Centaur properties, including Amazing-Man, as the roster of its own superhero team, the Protectors. Aside from the costume, the Malibu version was essentially identical to the original.

Amazing-Man was introduced into the Marvel Universe, with the character Prince of Orphans revealing his identity as John Aman at the end of Immortal Iron Fist #12 (Feb. 2008). Earlier in the issue, Prince of Orphans is seen turning into a green mist while battling Davos.