Gamora is a character appearing in American comic books published by Marvel Comics. Created by writer/artist Jim Starlin, the character first appeared in Strange Tales #180 (June 1975). Gamora is the adopted daughter of Thanos and the last of her species. Her powers include superhuman strength and agility and an accelerated healing factor. She also is an elite combatant, being able to beat most of the opponents in the galaxy. She is a member of the superhero group known as the Infinity Watch. The character played a role in the 2007 crossover storyline "Annihilation: Conquest", becoming a member of the titular team in its spin-off comic, Guardians of the Galaxy, before becoming the supervillain Requiem in the 2018 crossover storylines "Infinity Countdown" and "Infinity Wars".

Gamora has been featured in a variety of associated Marvel merchandise. Zoe Saldaña played the character in the Marvel Cinematic Universe films Guardians of the Galaxy (2014), Guardians of the Galaxy Vol. 2 (2017), and Avengers: Infinity War (2018), additionally portraying a version of the character from an alternate timeline in Avengers: Endgame (2019) and Guardians of the Galaxy Vol. 3 (2023). Ariana Greenblatt portrayed a young Gamora in Avengers: Infinity War.

Jim Starlin commented on the character's creation stating, "She's the straight man for the Pips and the Draxes and the what have you, which doesn't make her the most interesting character, but makes her essential to get the rest of the story moving. So I always treated her as such. I had one story in particular, one Infinity Watch story, where she tries to show everyone how much of an adult she is by dealing with these U.N. soldiers who eventually piss her off, and she wrecks everything, disproving her point entirely. But most of the time she's the solid one, the one that brings everyone back to the reality they should be at. I've always used her as a supporting character. She was created as a supporting character. I have a limit on how much work I can do, so I never shot off on thinking about solo adventures with her. Even when she wasn't in a group, she was always a supporting character for Adam Warlock. I'm sure I could find those hooks that would make a solo story, I've just never done it. She probably works either way, but I've only ever used her one way."

The character debuted in Strange Tales #180 (1975), and was created by Jim Starlin. She returned in issue #181, Warlock #9, 10, 11 and 15 (1975-1976), and in the 1977 annuals for The Avengers and Marvel Two-in-One. In 1990, she returned in Silver Surfer vol. 3 #46-47. She had a minor role in The Infinity Gauntlet #1-6 (1991) and co-starred in Warlock and the Infinity Watch #1-42 (1992-1995). She was also featured in the Infinity War (1992) and Infinity Crusade (1993) crossovers. After appearing in Infinity Abyss #1-6 (2002), Annihilation: Ronan #1-4 (2006), Annihilation #1-6 (2006), Annihilation: Conquest #6 (2008) and Nova vol. 4 #4-12 (2007-2008), Gamora costarred in Guardians of the Galaxy vol. 2 #1-25 (2008-2010). She played a minor role in The Thanos Imperative #1-6 (2010).

The character, along with the other Guardians, appears in Avengers Assemble issues #4-8 (2012). She stars in Guardians of the Galaxy vol. 3, a part of the Marvel NOW! relaunch, and in Guardians of the Galaxy vol. 4.^{[citation needed]} Parts of her origin story were told in a 2017 series titled Gamora that lasted five issues and were collected into the graphic novel Gamora: Memento Mori (2017). While being set on Earth-616, it retcons some elements of the established continuity to match the film version.^{[citation needed]}

Gamora is the last of her species, the Zen-Whoberis, who were exterminated by the Badoon (in her original timeline, her species was exterminated by the Universal Church of Truth). Thanos found her as a child and decided to use her as a weapon. Gamora was raised and trained by Thanos to assassinate the Magus, the evil, future version of Adam Warlock. Thanos showed her little kindness during her childhood, but Gamora was very loyal to the man who promised her the opportunity to avenge the death of her family. Gamora became very proficient in martial arts, earning the nickname "The deadliest woman in the whole galaxy". When she was a teenager, Thanos took her on a trip to Tartoonla #7. Gamora disobeyed Thanos's orders, and due to this, came into conflict with a group of thugs. She was greatly outnumbered, and despite her skills, she was defeated and then raped by the assailants. Thanos found her half dead, and in turn, murdered all of her assailants and restored her to health, cybernetically enhancing her to superhuman levels.

As an adult, Gamora was sent as an assassin against the Universal Church of Truth, quickly becoming feared by its agents, the Black Knights. She exacted revenge for the genocide of her race by killing every member of the church involved before the event occurred. Gamora met and teamed up with Adam Warlock, who wanted to stop his future, evil self. She even managed to get close to the Magus but failed her assassination in the last second. Together with Warlock, Pip the Troll and Thanos, Gamora fought to escape the Black Knights of the Universal Church of Truth and Magus's Death Squad. She was then assigned by Thanos to protect Warlock, but she became suspicious of Thanos's plans, and was then attacked by Drax the Destroyer.

Eventually the Magus was defeated, but Thanos revealed himself as a greater threat. Gamora aided Mar-Vell, Drax, and the Avengers against Thanos. Gamora and Pip tried to prevent Thanos from destroying half of all the life in the universe. Gamora attempted to slay Thanos, but he mortally wounded her, and destroyed Pip's mind. Adam Warlock found them, and Gamora warned Adam of Thanos's plans, and Adam absorbed their souls into his Soul Gem. When Warlock died as well, his spirit reunited with his friends in the world within the Soul Gem.