Rebirth of Mothra II (モスラ2 海底の大決戦, Mosura Tsū Kaitei no Daikessen, released in Japan as Mothra 2: The Battle Under the Deep Sea) is a 1997 Japanese kaiju film directed by Kunio Miyoshi, written by Masumi Suetani, and produced by Hiroaki Kitayama and Shōgo Tomiyama. Produced and distributed by Toho Studios, the film features the fictional monster character Mothra, and is the second film in the Rebirth of Mothra trilogy, following the previous year's Rebirth of Mothra.

Rebirth of Mothra II stars Sayaka Yamaguchi, Megumi Kobayashi, Aki Hano, and Hikari Mitsushima, and was the final tokusatsu film to feature special effects directed by Koichi Kawakita. The film was released in Japan on December 13, 1997, and was followed by Rebirth of Mothra III the following year.