Urusei Yatsura 2: Beautiful Dreamer is a 1984 Japanese animated fantasy comedy film written and directed by Mamoru Oshii. It is the second film in the Urusei Yatsura film series based on the manga of the same name by Rumiko Takahashi. Its predecessor, Only You, was also directed by Oshii. It was released in Japan on February 11, 1984 during the second season of the series.

While Only You was more faithful to Takahashi's original manga and anime series, Beautiful Dreamer was a significant departure, with Oshii placing an emphasis on deeper philosophical issues. Although the film initially received mixed responses upon its initial release, Beautiful Dreamer later received critical acclaim as an early example of Oshii’s well-received style of filmmaking. In 2009, Kinema Junpo ranked it as one of the best Japanese animated movies.

The film experimented with concepts such as a time loop, dreams, and simulated reality, and has drawn comparisons to later works including Oshii's directed Ghost in the Shell (1995), Groundhog Day (1993), Dark City (1998) and Inception (2010).