Justice League: The New Frontier is a 2008 animated superhero film adapted from the DC Comics limited series DC: The New Frontier.  An unknown entity has decided to eradicate mankind due to its capacity of violence.

The film was written by Stan Berkowitz, with Darwyn Cooke providing additional material.  The film received a rating of PG-13 for violent content and images, and was released on February 26, 2008. It is the second film of the DC Universe Animated Original Movies by Warner Bros. Animation.  The film had its broadcast premiere on October 18, 2008 on Cartoon Network. It was broadcast again on December 20, 2020 on Cartoon Network's nighttime Adult Swim programming block through Toonami, as a celebration for the then-upcoming release of Wonder Woman 1984.