The Lego Ninjago Movie is a 2017 animated martial arts comedy film produced by Warner Animation Group, RatPac Entertainment, Lego System A/S, Lin Pictures, Lord Miller Productions, and Vertigo Entertainment, and distributed by Warner Bros. Pictures. Based on the toy/kit line of the same name, and TV show starring the same characters, it was directed by Charlie Bean, Paul Fisher, and Bob Logan from a screenplay by Logan, Fisher, William Wheeler, Tom Wheeler, Jared Stern, and John Whittington. It is the first theatrical film to be based on an original Lego property and the third installment in The Lego Movie franchise as well as its second spin-off. The film stars the voices of Dave Franco, Michael Pena, Kumail Nanjiani, Abbi Jacobson, Zach Woods, Fred Armisen, Justin Theroux and Olivia Munn, as well as a live-action role by Jackie Chan. The film focuses on a teenage ninja Lloyd Garmadon, as he attempts to accept the truth about his sinister father and learn what it truly means to be a ninja warrior as a new threat emerges to endanger his homeland.

Lego Ninjago is a Lego theme that was created in 2011 and a flagship brand of The Lego Group. It is the first theme to be based on ninja since the discontinuation of the Lego Ninja theme in 2000. It was produced to coincide with the animated television series Ninjago, which was superseded in 2023 by a new series titled Ninjago: Dragons Rising.