Battle: Los Angeles (also known as Battle: LA, stylised as Battle Los Angeles in the opening sequence and internationally as World Invasion: Battle Los Angeles) is a 2011 American military science-fiction action film directed by Jonathan Liebesman and written by Chris Bertolini. The story follows a Marine staff sergeant played by Aaron Eckhart who leads a platoon of U.S. Marines, joined by other stranded military personnel, defending Los Angeles from an alien invasion. The ensemble cast includes Michelle Rodriguez, Ramon Rodriguez, Bridget Moynahan, Ne-Yo, and Michael Peña.

The film was a co-production of Columbia Pictures, Relativity Media, and producers Neal H. Moritz and Ori Marmur's Original Film. It was distributed by Columbia, while Sony Pictures Home Entertainment released the film in the video rental market. The film won the BMI TV Music Award for composer Brian Tyler. The film score was orchestrated by Tyler in conjunction with the Hollywood Studio Symphony. The soundtrack was released by the Varèse Sarabande music label on March 8, 2011.

Principal photography began in September 2009, and the film was released in the United States on March 11, 2011. It grossed $212 million worldwide against a production budget of around $70–77 million, and received mostly negative reviews from critics. It was released on DVD and Blu-ray on June 14, 2011.