Bionicle: The Legend Reborn is a 2009 animated science fantasy action film based on the Bionicle toy line by Lego. It is the fourth and final Bionicle film to be released. Distributed by Universal Studios Home Entertainment, the film is a stand-alone sequel to the trilogy of films released by Buena Vista Home Entertainment under the Miramax Home Entertainment label. It follows the toy line's 2009 story and features a different set of characters than that of the first three films. The Legend Reborn was released on September 15, 2009, in the United States and Canada, October 5 in the United Kingdom, and September 2 in Australia. The film stars Michael Dorn as the voice of Mata Nui.

The Legend Reborn was intended to be the start of a trilogy of films, but production on the sequels was cancelled due to Lego discontinuing the release of Bionicle toys in 2010. The story was concluded through other media outlets, including comic books and a web story titled the "Mata Nui Saga".