Ebirah, Horror of the Deep (ゴジラ・エビラ・モスラ　南海の大決闘, Gojira Ebira Mosura Nankai no Dai-kettō, lit. Godzilla, Ebirah, Mothra: Big Duel in the South Seas) is a 1966 Japanese kaiju film directed by Jun Fukuda and produced and distributed by Toho Co., Ltd. The film stars Akira Takarada, Kumi Mizuno, Akihiko Hirata and Eisei Amamoto, and features the fictional monster characters Godzilla, Mothra, and Ebirah. It is the seventh film in the Godzilla franchise, and features special effects by Sadamasa Arikawa, under the supervision of Eiji Tsuburaya. In the film, Godzilla and Ebirah are portrayed by Haruo Nakajima and Hiroshi Sekita, respectively.

During its development, Ebirah, Horror of the Deep was intended to feature King Kong, but the character was replaced by Godzilla. The film was released to theaters in Japan on December 17, 1966, and was released directly to television in the United States under the title Godzilla vs. the Sea Monster in 1968 by Continental Distributing.

The film was followed by the eighth film in the Godzilla franchise, Son of Godzilla, released on December

16, 1967.