Calamity of Snakes (人蛇大战; Ren she da zhan) is a 1982 horror film directed by Chi Chang (also known as William Cheung Kei). An international co-production of Taiwan and Hong Kong, the film concerns the residents of a newly built apartment building being attacked by thousands of vengeful snakes, which seek retribution for the killing and displacement of multitudes of snakes at the site of the building's construction.

Rather than utilizing special effects to depict violence against snakes, Calamity of Snakes features genuine footage of snakes being mutilated and killed, including being burned alive.