Battle of the Japan Sea (Japanese: 日本海大海戦, Hepburn: Nihonkai Daikaisen, lit.

'The Great Battle in the Japan Sea') is a 1969 Japanese epic war film directed by Seiji Maruyama, with special effects by Eiji Tsuburaya.

[3][4] The film stars Toshiro Mifune, Yūzō Kayama, Tatsuya Nakadai, Toshio Kurosawa, Makoto Satō, Ryutaro Tatsumi, Chishū Ryū, and Matsumoto Kōshirō VIII.

[4] In the film, the Imperial Japanese Navy and army fail in their attempts to seize Port Arthur, and the Russian Pacific Fleet bears down on the Japan Sea during the Russo-Japanese War.

Battle of the Japan Sea was the last film for special effects director Eiji Tsuburaya before his death.