The Squadron Supreme is a superhero team appearing in American comic books published by Marvel Comics, of which there are several notable alternate versions. The original team was created by Roy Thomas and John Buscema, derived from the previously created supervillain team Squadron Sinister.

The core members of the Squadron Supreme are Hyperion, Nighthawk, Doctor Spectrum, Power Princess, and the Whizzer, pastiches of prominent members of rival publisher DC Comics' superhero team the Justice League. Many other characters were later added to the roster, not all of which were based on DC heroes.

The Squadron Supreme has its roots in the Squadron Sinister, which first appeared in The Avengers #69 as a pastiche of the Justice League. Roy Thomas later introduced a heroic version of the Squadron Sinister named the Squadron Supreme, which first appeared in The Avengers #85–86 (Feb.–March 1971), and which was co-created with John Buscema. The team then had guest appearances on several more occasions, and in 1985 was featured in a self-titled twelve-issue limited series by Mark Gruenwald, followed in 1989 by a graphic novel sequel by Gruenwald, Ryan and inker Al Williamson, Squadron Supreme: Death of a Universe, in which the Nth Man serves as the main antagonist.

In 2003, a reimagined Squadron Supreme appeared in an ongoing series entitled Supreme Power, published under the mature-audience MAX imprint. This version was created by writer J. Michael Straczynski and artist Gary Frank.^{[citation needed]}

Yet another Squadron Supreme was introduced in 2015, written by James Robinson and drawn by Leonard Kirk.^{[citation needed]} Unlike the previous teams, which had appeared in alternate realities, this team was based in Marvel's main "Earth-616" reality, although the team members were from a variety of alternate universes that had been destroyed in the aftermath of the 2015 Secret Wars event.

Another version of the Squadron Supreme, set in the Marvel Universe, was introduced by Jason Aaron in The Avengers vol. 8.^{[citation needed]} The Squadron, created by Mephisto and led by Phil Coulson, acts as the US government's sanctioned superhero team in place of the Avengers. This version of the team is the focus of the Heroes Reborn storyline, where reality is overwritten so that the Avengers were never formed and the Squadron Supreme are Earth's premier superhero team instead.^{[citation needed]}

The Squadron Supreme are first encountered by four members of the Avengers – the Vision, Quicksilver, the Scarlet Witch and Goliath – who have arrived in the Earth-712 universe by mistake. The Avengers are initially confused, since several members of the Squadron Supreme have identical names and powers to the Squadron Sinister, a group of previously encountered villains. After a brief battle, the Avengers assist the Squadron Supreme against the global threat posed by the mutant Brain-Child, before returning to their own universe. The Squadron Supreme have another series of skirmishes with the Avengers engineered by the group the Serpent Cartel, but eventually they join forces and prevent the use of the Serpent Crown.

The team features briefly in the title Thor, when the evil version of Hyperion attacks the Earth-712 version and then the Earth-616 Thor. The Squadron appear in the title The Defenders as mind-controlled pawns of the entities the Over-Mind and Null the Living Darkness, but are freed and aid the Defenders in defeating the villains. Earth-712, however, is left in a post-apocalyptic state.^{[volume & issue needed]}