The Guardians of the Galaxy are a superhero team that has starred in the comic book series of the same name, published by Marvel Comics. The original team, based in an alternate universe within the Marvel Comics continuity, debuted in the comic book Marvel Super-Heroes #18 (January 1969). Another team, this time based in the mainstream Marvel Universe, debuted in the comic Guardians of the Galaxy (vol. 2) #1 (May 2008).
These are the members of the original, Earth-691 Guardians of the Galaxy team.
These are the members of the mainstream Marvel Universe Guardians of the Galaxy team. They are separated by the period when they joined.
Guardians of the Galaxy Vol. 2 (2017) also features a version of the original team, known as the Ravagers.