Avengers: Doomsday is an upcoming American superhero film based on the Marvel Comics superhero team the Avengers. Produced by Marvel Studios and AGBO, and distributed by Walt Disney Studios Motion Pictures, it is intended to be the fifth installment in the Avengers film series following Avengers: Endgame (2019) and the 39th film in the Marvel Cinematic Universe (MCU). Directed by Anthony and Joe Russo and written by Michael Waldron and Stephen McFeely, the film features an ensemble cast including Chris Hemsworth, Vanessa Kirby, Anthony Mackie, Sebastian Stan, Letitia Wright, Paul Rudd, Wyatt Russell, Tenoch Huerta Mejía, Ebon Moss-Bachrach, Simu Liu, Florence Pugh, Kelsey Grammer, Lewis Pullman, Danny Ramirez, Joseph Quinn, David Harbour, Winston Duke, Hannah John-Kamen, Tom Hiddleston, Patrick Stewart, Ian McKellen, Alan Cumming, Rebecca Romijn, James Marsden, Channing Tatum, Pedro Pascal, and Robert Downey Jr. In the film, the Avengers, Wakandans, Fantastic Four, Thunderbolts, and the X-Men team up to face Doctor Doom (Downey).

Two new Avengers films, The Kang Dynasty and Secret Wars, were announced in July 2022 as the conclusion of the MCU's Phase Six and "The Multiverse Saga". Destin Daniel Cretton was hired to direct The Kang Dynasty and Jonathan Majors was set to reprise his MCU role as the villain Kang the Conqueror. Jeff Loveness joined the film as writer that September. In November 2023, Cretton departed, Waldron replaced Loveness as writer, and Marvel was considering moving away from the Kang storyline, in part due to Majors's legal issues; Majors was fired the following month. The return of the Russo brothers as directors and McFeely as writer, the casting of Downey as new villain Doctor Doom, and the new subtitle Doomsday were all announced in July 2024. Filming is taking place from April to August 2025 at Pinewood Studios in England, with a large cast consisting mainly of actors from previous MCU media and other Marvel films.

Avengers: Doomsday is scheduled to be released in the United States on May 1, 2026, as part of Phase Six of the MCU. The film's sequel, Secret Wars, is set to be released on May 7, 2027.