Swamp Thing is an American animated television series based on the DC Comics character Swamp Thing. The series is short-lived, with the pilot episode airing on October 31, 1990 followed by four additional episodes airing weekly from April 20 to May 11, 1991. Produced by DIC Entertainment, the series corresponded with Kenner's Swamp Thing action figure collection released in 1990. Despite the animated series' brief run, various merchandise was also produced in 1991 resulting in the only significant marketing platform ever created for the character.

Like previous film incarnations of Swamp Thing, the animated series rejects the popular Alan Moore revision of Swamp Thing's origin and portrays him with his original origin as a man turned into a plant-like entity. Anton Arcane takes the role of the main villain responsible for Alec Holland's transformation into Swamp Thing. Arcane is backed by his gang of Un-Men: Dr. Deemo, Weedkiller, and Skinman. Swamp Thing also has two friends named Tomahawk and Bayou Jack. Tomahawk is Native American not to be confused with the DC/Vertigo character, Thomas Hawk, who was a soldier in the American Revolution rescued by Native Americans. Bayou Jack is a Vietnam veteran.