Swamp Thing is a fictional character, a plant elemental published by DC Comics He first appeared in House of Secrets #92 (July 1971), and was created by Len Wein and Berni Wrightson. The character is a humanoid mass of vegetable matter who fights to protect his swamp home, the environment in general, and humanity from various supernatural or terrorist threats.

The character found perhaps his greatest popularity during the 1980s and early '90s. Outside of an extensive comic book history, the Swamp Thing property has inspired two theatrical films, a live-action television series, and a 5-part animated series among other media.