Zilla is a fictional monster, or kaiju, in Toho Co., Ltd.'s Godzilla media franchise. The character first appeared in Godzilla (1998), released by TriStar Pictures. It was initially created as a reimagining of Godzilla but was later re-branded as a separate character appearing alongside Toho's Godzilla. Patrick Tatopoulos designed it after iguanas with a slim theropod appearance rather than the thick, bipedal designs of Toho's Godzilla. TriStar's Godzilla, both the film and character, were negatively received by fans and critics. In 2004, it was featured in Toho's Godzilla: Final Wars as "Zilla". Afterwards, Toho trademarked new incarnations as Zilla, with only the iterations from the 1998 film and animated series retaining the Godzilla copyright and trademark.

Godzilla is a Japanese monster, or kaiju, media franchise consisting of films, television series, novels, comic books, video games, and other merchandise. The franchise is centered on the fictional kaiju Godzilla, a prehistoric reptilian monster awakened and powered by nuclear radiation. The franchise is recognized by the Guinness World Records as the "longest continuously running film franchise", having been in ongoing production since 1954, with several hiatuses of varying lengths. The film franchise consists of 38 films: 33 Japanese films produced and distributed by Toho Co., Ltd.; and five American films, the first of which was produced by TriStar Pictures and the remaining four by Legendary Pictures, with the latest being released in March 2024.