Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (often abbreviated as GMK) is a 2001 Japanese kaiju film directed and co-written by Shusuke Kaneko. The 26th film in the Godzilla franchise and the third of the Millennium era, it serves as a direct sequel to Godzilla (1954), ignoring the events of every other installment in the series (albeit briefly referencing the 1998 American film). Chiharu Niiyama stars as a reporter covering the story of Mothra, King Ghidorah, and Baragon defending Japan from Godzilla, a creature possessed by the souls of those killed during the Pacific War. The supporting cast includes Ryudo Uzaki, Masahiro Kobayashi, Hideyo Amamoto, and Shirō Sano, with Mizuho Yoshida as Godzilla, Akira Ohashi as Ghidorah, and Rie Ōta as Baragon.

Kaneko originally slated Godzilla to face off against a revamped version of Kamacuras but ultimately decided to place Godzilla against three monsters representing elements of the Earth. The initial three monsters he pitched were Varan, Baragon, and Anguirus, however, Toho later convinced him to replace Varan and Anguirus with King Ghidorah and Mothra to attract more public interest. Principal photography began on May 11, 2001, on a $7–9 million budget, at Toho Studios, and wrapped on August 9.

Godzilla, Mothra and King Ghidorah premiered at the Tokyo International Film Festival on November 3, 2001. Toho later released it throughout Japan on December 15, as a double feature with Hamtaro: Adventures in Ham-Ham Land. The film earned $20 million internationally and tied in Japan for the position of the third-highest-grossing domestic film during 2002. Godzilla, Mothra and King Ghidorah received generally positive reviews from critics, with many considering it among the best in the Godzilla series. It was followed by Masaaki Tezuka's Godzilla Against Mechagodzilla (2002), which is set in a different continuity.