The Lego Batman Movie (stylized as The LEGO Batman Movie) is a 2017 animated superhero comedy film produced by Warner Animation Group, DC Entertainment, RatPac Entertainment, Lego System A/S, Lin Pictures, Lord Miller Productions, and Vertigo Entertainment, and distributed by Warner Bros. Pictures. It was directed by Chris McKay (in his feature directorial debut) from a screenplay by Seth Grahame-Smith, Chris McKenna, Erik Sommers, Jared Stern, and John Whittington. Based on the characters from the DC Universe created by DC Comics and the Lego DC Super Heroes' Batman toy line, the film is a collaboration between production houses from the United States, Australia, and Denmark, the first spin-off in The Lego Movie franchise and the second installment overall. The film features Will Arnett reprising his role as Batman from The Lego Movie alongside Zach Galifianakis, Michael Cera, Rosario Dawson, and Ralph Fiennes. The story follows the title character (Arnett) as he attempts to overcome his greatest fear to stop the Joker's (Galifianakis) latest plan.

Development of The Lego Batman Movie started in October 2014, after Warner Bros. announced several Lego films, following the critical and commercial success of The Lego Movie, while Chris McKay was hired to direct the film after being replaced by Rob Schrab to direct the sequel to The Lego Movie. He cited both The Naked Gun and Airplane! film series as his main inspirations. Casting call began in July to November 2015. The film pays homage to previous Batman films, cartoons, and comics. The film also features characters from other notable franchises and film series with them. Like The Lego Movie, the animation was provided by Animal Logic. Lorne Balfe composed the film's musical score.

The Lego Batman Movie had its world premiere in Dublin, Ireland on January 29, 2017, and was released in the United States on February 10, 2017 in RealD 3D, Dolby Cinema, IMAX, IMAX 3D and 4DX formats. The film received generally positive reviews from critics for its animation, voice acting, music, visual style, and humor, and was also commercially successful, having grossed $312 million worldwide against a budget of around $80 million. A sequel, Lego Superfriends, was announced in 2018, but was cancelled after Universal Pictures acquired the Lego franchise rights.