Green Lantern is a 2011 American superhero film based on the DC Comics character of the same name. The film stars Ryan Reynolds, Blake Lively, Peter Sarsgaard, Mark Strong, Angela Bassett, and Tim Robbins, with Martin Campbell directing a script by Greg Berlanti and comic book writers Michael Green and Marc Guggenheim that was subsequently rewritten by Michael Goldenberg. This was the first DC film since Catwoman (2004) not to be involved with Legendary Pictures. The film tells the story of Hal Jordan, a test pilot who is selected to become the first human member of an intergalactic police force called the Green Lantern Corps; he is given a ring that grants him superpowers, and must confront Parallax, a being who threatens to upset the balance of power in the universe, while a new threat rises back on Earth.

Green Lantern is the name of several superheroes appearing in American comic books published by DC Comics. They fight evil with the aid of rings that grant them a variety of extraordinary powers, all of which come from imagination, fearlessness, and the electromagnetic spectrum of emotional willpower. The characters are typically depicted as members of the Green Lantern Corps, an intergalactic law enforcement agency.