The Asgard are a fictional highly advanced and benevolent race in the science fiction series Stargate SG-1 and Stargate Atlantis. They are first mentioned in the episode "Thor's Hammer", and first seen in "Thor's Chariot". In the series, the Asgard gave rise to Norse mythology on Earth, as well as accounts of the Roswell "Greys". Due to their technological prowess, the Asgard are critical allies in Earth's fight against the Goa'uld, and later the Ori. The Asgard characters on the show are realized through a combination of puppets and computer-generated imagery.

In the fictional universe of the science fiction TV show Stargate Atlantis, the Athosians are a race of humans from from the planet Athos in the Pegasus Galaxy (see also: Human civilizations in Stargate Atlantis). They become friends of the Atlantis Expedition and their leader, Teyla Emmagan, joins John Sheppard's team.