Bulgasari is a lost 1962 South Korean kaiju film directed and edited by Kim Myeong-je. Produced by Kwang Seong Films Co., Ltd., it was the first monster film to be made in South Korea, as well as the first Korean film to use special effects. The film stars Choi Moo-ryong as Nam Hyeong / Bulgasari alongside Um Aing-ran, Gang Mi-ae, Kim Dong-won, and Lee Up-dong. In the film, a skilled martial artist is resurrected as an iron-eating monster in order to exact revenge on those who murdered him.

Bulgasari was reported to have begun production on November 26, 1961. It was inspired by the legendary Korean monster of the same name and heavily influenced by Godzilla (1954). On an approximately ₩3.5 million budget, Bulgasari began principal photography on February 28, 1962, and wrapped on March 24.

Bulgasari premiered at the Myungbo Theater in Seoul on December 1, 1962. The film received negative reviews from critics, especially because of its unconvincing special effects, direction, and acting. Believed to have disappeared shortly after its release, the film is considered a significant feature in the history of South Korean cinema and one of the most sought-after lost kaiju films. Shin Sang-ok directed a 1985 remake of the film after he was abducted into North Korea.