Godzilla (Japanese: ゴジラ, Hepburn: Gojira) is a 1954 Japanese epic kaiju film directed and co-written by Ishirō Honda, with special effects by Eiji Tsuburaya. Produced and distributed by Toho Co., Ltd., it is the first film in the Godzilla franchise. The film stars Akira Takarada, Momoko Kōchi, Akihiko Hirata, and Takashi Shimura, with Haruo Nakajima and Katsumi Tezuka as Godzilla. In the film, Japan's authorities deal with the sudden appearance of a giant monster, whose attacks trigger fears of nuclear holocaust in post-war Japan.

Godzilla entered production after a Japanese-Indonesian co-production collapsed. Tsuburaya originally proposed for a giant octopus before the filmmakers decided on a dinosaur-inspired creature. Godzilla pioneered a form of special effects called suitmation in which a stunt performer wearing a suit interacts with miniature sets. Principal photography ran 51 days, and special effects photography ran 71 days.

Godzilla premiered in Nagoya on October 27, 1954, and received a wide release in Japan on November 3. It was met with mixed reviews upon release but was a box-office success, winning the Japanese Movie Association Award for Best Special Effects. The film earned ¥183 million in distributor rentals, making it the eighth-highest-grossing Japanese film of that year. In 1956, a heavily-re-edited "Americanized" version, titled Godzilla, King of the Monsters!, was released in the United States.

The film spawned a multimedia franchise that was recognized by Guinness World Records as the longest-running film franchise in history. The character Godzilla has since become an international popular culture icon. The film and Tsuburaya have been largely credited for establishing the template for tokusatsu media. The film received reappraisal in later years and has since been regarded as one of the best monster films ever made.

The film was followed by the sequel Godzilla Raids Again, released on April 24, 1955.