Adam Warlock is a character appearing in American comic books published by Marvel Comics. The character first appeared in Fantastic Four #66–67 (cover-dates September 1967 and October 1967) created by Stan Lee and Jack Kirby, originally named Him. The character would later be significantly developed by Roy Thomas and Jim Starlin. Debuting in the Silver Age of Comic Books, the character has starred in the titles Marvel Premiere and Strange Tales as well as five eponymous volumes and several related limited series.

Adam Warlock is artificially created on Earth by the Enclave to be a perfect being and the next evolution of humanity. Originally known only as "Him", he learned of his creators' intentions and rebelled against them to seek a new destiny. Eventually coming across the High Evolutionary, the rechristened Adam Warlock ultimately becomes a hero of the universe, chiefly protecting it from threats such as Thanos, the Universal Church of Truth, and his evil counterpart, the Magus. He is also frequently the bearer of the Soul Stone, one of the fabled Infinity Gems (now called Infinity Stones). The character also serves as the leader of the Infinity Watch and a member of the Guardians of the Galaxy, specializing as the latter's cosmic sorcerer and occult expert.

Adam Warlock has been adapted in various forms of media, including animated television series and video games, and was portrayed by Will Poulter in his live-action debut in the Marvel Cinematic Universe film Guardians of the Galaxy Vol. 3 (2023).

The character's origin was shown in Fantastic Four #66 (September 1967) in a story written by Stan Lee and pencilled and co-plotted by Jack Kirby. The character also appeared in Fantastic Four #67 (October 1967) and Thor #163–166 (April–July 1969). Because his role in the Fantastic Four story was minor, sources disagree on which issue is the character's true first appearance. Writer and then editor-in-chief Roy Thomas and penciler Gil Kane significantly revamped Him as Adam Warlock in Marvel Premiere #1 (April 1972).

In 2009, Thomas explained he had been a fan of the soundtrack to the musical Jesus Christ Superstar and sought to bring the story to comic books in a superhero context: "Yes, I had some trepidation about the Christ parallels, but I hoped there would be little outcry if I handled it tastefully, since I was not really making any serious statement on religion... at least not overtly."

Choosing to use a preexisting character while keeping the series locale separate from mainstream Marvel Earth, Thomas created Counter-Earth, a new planet generated from a chunk of Earth and set in orbit on the opposite side of the sun. Thomas and Kane collaborated on the costume, with the red tunic and golden lightning bolt as their homage to Fawcett Comics' 1940s–1950s character Captain Marvel.

The story continued in the series The Power of Warlock, which ran eight issues (August 1972 – October 1973), with some plotlines concluded in The Incredible Hulk vol. 2, #176–178 (June–August 1974).

In a 2009 retrospective survey of the character, writer Karen Walker said the series