This is a list of alien races that appear in Marvel Comics.

There are countless different extraterrestrial races in Marvel Comics universe. The vast majority are humanoid in structure.

The Galactic Council is the assembly of numerous leaders of different alien empires across the universe created to deal with different matters of the universe.

The Galactic Council appears in Guardians of the Galaxy, consisting of J'son, Thor, Irani Rael, the Rigellian Grand Commissioner, and the Supreme Intelligence.

A few alien races have had considerable "air time" in various Marvel Comics publications over the years, having a near-constant presence or major crossovers and storylines involving them. This includes:

The Badoon (first seen in Silver Surfer #2) are reptilian aliens that are notable for living under strict gender segregation, resulting in two separate societies: the Brotherhood of Badoon (ruled by a "Brother Royal") and the Sisterhood of Badoon (ruled by a Queen).

The Beyonders (first mentioned in Marvel Two-in-One #63) are enigmatic, virtually omnipotent entities powerful enough to collect planets. They are unable to leave their own dimension and have never been observed by any being of the Earth dimension and to interact with the Earth dimension they must operate through agents. The most notable member of the Beyonders is the Beyonder.

The Brood (first seen in The Uncanny X-Men #155) are a race of insectoid, parasitic, extraterrestrial beings.