Digimon Adventure: Our War Game! , also known as Digimon Adventure: Children's War Game!, is a 2000 Japanese anime short film directed by Mamoru Hosoda and produced by Toei Animation. A part of the Digimon media franchise, Our War Game is a sequel to the 1999 anime television series Digimon Adventure and is the second Digimon film overall. The film premiered in Japan on March 4, 2000 as part of the Toei Anime Fair ; in North America, portions of Our War Game were included in the 2000 film Digimon: The Movie. Hosoda has cited Our War Game! as a major influence on his 2009 film Summer Wars, with critics noting numerous similarities between the films. The events of the film take place during the first season of Digimon Adventure.

Mamoru Hosoda is a Japanese film director and animator. He was nominated for an Academy Award in the category Best Animated Feature Film at the 91st Academy Awards for his seventh film Mirai.