Princess Mononoke (Japanese: もののけ姫, Hepburn: Mononoke-hime) is a 1997 Japanese animated historical fantasy film written and directed by Hayao Miyazaki. Set in the Muromachi period of Japanese history, the film follows Ashitaka, a young Emishi prince who journeys west to cure his cursed arm and becomes embroiled in the conflict between Irontown and the forest of the gods, as well as the feud between Lady Eboshi and a human girl raised by wolves named San. Produced by Toshio Suzuki, animated by Studio Ghibli, and distributed by Toho, it stars the voices of Yōji Matsuda, Yuriko Ishida, Yūko Tanaka, Kaoru Kobayashi, Masahiko Nishimura, Tsunehiko Kamijō, Akihiro Miwa, Mitsuko Mori, and Hisaya Morishige.

Miyazaki began developing early concepts in 1980 and later considered basing a film on the Japanese literary classic the Hōjōki (1212); elements of both evolved substantially into the eventual film. After taking a break to direct On Your Mark (1995), he led the production with a budget of ¥2.35 billion, making it the most expensive animated film at the time. Some computer-generated imagery and other digital techniques were used in conjunction with hand-drawn animation, a first for Miyazaki. The film explores themes of environmentalism and societal diversity, partly inspired by Miyazaki's readings into novel historical and cultural studies, and presents a feminist portrayal of its characters. It also blends fantastical elements with its depiction of medieval Japanese history, influenced by the jidaigeki style. The score was composed by Joe Hisaishi, a longtime collaborator of Miyazaki's.

Princess Mononoke was theatrically released in Japan on July 12, 1997, breaking several box office records and attracting large audiences. Suzuki led the film's marketing, then the largest advertisement campaign in Japan. It eventually became the highest-grossing film in the country. Following a distribution deal struck between Tokuma Shoten and Walt Disney Studios, it was the first of Studio Ghibli's films to be released internationally and was given to Miramax Films to be dubbed into English and distributed in North America. Neil Gaiman wrote the translation, making significant alterations for its American audience; the dub underperformed at the box office. As of 2020, the film has grossed US$194.3 million through various theatrical and home media releases. It received a broadly positive critical response in both Japan and the United States and earned a number of major Japanese accolades, including top awards at the Mainichi Film Awards and the Japan Academy Film Prize. Its sustained popularity and cultural impact have since made it a cult film.