Justice League is an American animated television series which ran from November 17, 2001 to May 29, 2004 on Cartoon Network. The show was produced by Warner Bros. Animation. It is based on the Justice League of America and associated comic book characters published by DC Comics. It serves as a sequel to Batman: The Animated Series and Superman: The Animated Series, as well as a prequel to Batman Beyond, and is the seventh series of the DC Animated Universe. After two seasons, the series was rebranded as Justice League Unlimited, a successor series which aired for three seasons.

The Justice League, or Justice League of America (JLA), is a group of superheroes appearing in American comic books published by DC Comics. The team first appeared in The Brave and the Bold #28. The team was conceived by writer Gardner Fox as a revival of the Justice Society of America, a similar team from DC Comics from the 1940s which had been pulled out of print due to a decline in sales.