COBRA (sometimes referred to as Cobra Command) is a fictional terrorist organization and the nemesis of the G.I. Joe Team in the Hasbro action figure toyline G.I. Joe: A Real American Hero and G.I. Joe: Sigma 6, as well as in related media.

Cobra was first introduced during the launch of the G.I. Joe: A Real American Hero toyline in mid-1982. The toyline was accompanied by a Marvel Comics series, written by Larry Hama, and an animated television series by Sunbow and Marvel Productions. However, the origin and portrayal of Cobra has differed in each of them.

Marvel Comics invented the Cobra concept, with the name having been proposed by Archie Goodwin. When Marvel first proposed the concept, Hasbro was reluctant to make toys of the villains for fear that they would not sell. According to Jim Shooter, "later ... villains became 40% of their volume." Cobra's iconic logo was later created by Hasbro designer Ron Rudat.

All members of the Cobra organization are portrayed as fighting against G.I. Joe, however, there are several internal power struggles within the group.

There are different factions of Cobra:

The Black Dragon is an organization that works for Cobra. While the original group was wiped out during the Cold War by the original G.I. Joe team, there was a survivor who formed the next incarnation of the group who allied with Cobra. The Black Dragon Leader has the Black Dragon organization consisting of Black Dragon Troopers and Black Dragon Ninjas.

Cobra-La is an ancient civilization led by Golobulus that Cobra was said to have connections with in different adaptions. He is served by Pythona, Nemesis Enforcer, and his Royal Guards.

The Coil is a religious wing of Cobra and a highly influential cult that is known to the public as a self-help group.