Transformers One is an American animated science fiction action film based on Hasbro's Transformers toy line. It was directed by Josh Cooley from a screenplay by Eric Pearson and the writing duo of Andrew Barrer and Gabriel Ferrari, based on a story by Barrer and Ferrari. The ensemble voice cast includes Chris Hemsworth, Brian Tyree Henry, Scarlett Johansson, Keegan-Michael Key, Steve Buscemi, Laurence Fishburne, and Jon Hamm. The film depicts the origins and early relationship of Optimus Prime and Megatron and how they forever changed the fate of Cybertron, the home planet of the Transformers. It is the franchise's first theatrical animated feature film since The Transformers: The Movie (1986).

Transformers One was theatrically released in the United States by Paramount Pictures on September 20, 2024.