Sailor Moon Eternal is a 2021 Japanese two-part animated action fantasy film directed by Chiaki Kon and written by Kazuyuki Fudeyasu based on the Dream arc of the Sailor Moon manga by Naoko Takeuchi, who also serves as a chief supervisor. Co-produced by Toei Animation and Studio Deen and distributed by Toei Company, Eternal is a direct continuation and a "fourth season" for the Sailor Moon Crystal anime series. The two-part film stars Kotono Mitsuishi as the voice of Sailor Moon alongside Hisako Kanemoto, Rina Satō, Ami Koshimizu, Shizuka Itō, Misato Fukuen, Kenji Nojima, Junko Minagawa, Sayaka Ohara, Ai Maeda, Yukiyo Fujii, Ryō Hirohashi, Taishi Murata, Shoko Nakagawa, Yoshitsugu Matsuoka, Naomi Watanabe, and Nanao. Eternal was released in Japan in 2021, with the first film on January 8, and the second film on February 11.

The two-part film is the first in the franchise to screen in Japanese theaters in 26 years, the last one having been Sailor Moon SuperS: The Movie, released in 1995.

Netflix acquired streaming rights to both films, and they premiered on June 3, 2021, on the streaming service. A sequel two-part film, Sailor Moon Cosmos, was released in Japan on June 9 and 30, 2023 and was released on Netflix worldwide on August 22, 2024.