Valerian and the City of a Thousand Planets (French: Valérian et la Cité des mille planètes) is a 2017 space opera film written and directed by Luc Besson, and produced by his wife, Virginie Besson-Silla. It is based on the French science fiction comics series Valérian and Laureline, written by Pierre Christin, illustrated by Jean-Claude Mézières, and published by Dargaud. It stars Dane DeHaan and Cara Delevingne as Valerian and Laureline, respectively, with Clive Owen, Rihanna, Ethan Hawke, Herbie Hancock, Kris Wu and Rutger Hauer in supporting roles. Besson independently financed and personally funded the film. With a production budget of around $180 million, it is both the most expensive European and the most expensive independent film ever made.

Two operatives of the United Human Federation are on a mission to Alpha, a city inhabited by thousands of species from different planets. Their latest mission is to uncover a destructive force beneath the sprawling city, realizing it threatens not just Alpha, but the entire universe.

Valerian and the City of a Thousand Planets was released on 20 July 2017 in Germany by Buena Vista International and Universum Film, in the United States on 21 July by STXfilms, in France on 26 July by EuropaCorp Distribution, in China on 25 August by China Film Group, in Belgium on 26 August by Belga Films, and 27 November in United Arab Emirates by Gulf Film. It received mixed reviews from critics, who criticised the plot and some of the casting, but praised the visuals. It grossed $226 million worldwide, but due to its high production and advertising costs, was considered a box-office bomb following its release in the United States.