The Divergent Series: Allegiant (simply known as Allegiant) is a 2016 American dystopian science fiction action film directed by Robert Schwentke with a screenplay by Bill Collage, Adam Cooper, and Noah Oppenheim, and the third and final film in The Divergent Series. It was set to be the first of two cinematic parts based on the 2013 novel Allegiant of the Divergent trilogy by Veronica Roth (the second cinematic part was to be named Ascendant).

The film stars Shailene Woodley, Theo James, Jeff Daniels, Miles Teller, Ansel Elgort, Zoë Kravitz, Maggie Q, Ray Stevenson, Bill Skarsgård, Octavia Spencer, and Naomi Watts. Set in a post-apocalyptic and dystopian Chicago, the story follows Tris Prior, her boyfriend Four, and their small group of friends escaping over the wall that enclosed the city. Once outside they discover new truths that will shift their alliances and introduce new threats.

Principal photography primarily took place in Atlanta, Georgia, from May 2015 until August that same year. The film was initially titled The Divergent Series: Allegiant – Part 1, in September 2015, Part 1 was renamed Allegiant and Part 2 as Ascendant. Allegiant was released on March 18, 2016, in theaters and IMAX. It received generally negative reviews from critics, who criticized the lack of originality, character development, and the decision to split the film into two parts. The film was a box-office bomb, grossing just $179.2 million worldwide against its estimated budget of $110–142 million, becoming the lowest-grossing film in The Divergent Series. Following budget cuts, a theatrical release for Ascendant was dropped in favor of reconfiguring the project as a television film for Starz that would be followed by a spinoff series. Both projects were later canceled, effectively ending the franchise.