Reptilicus is a 1961 Danish-American monster film about a prehistoric reptile. The film was produced by Cinemagic and Saga Studio and separate versions were released in Denmark and in the United States, with American International Pictures handling distribution for the latter.

Filming took place in several locations in Denmark, including Copenhagen, Sjælland, and Jylland. Several versions were filmed. The original was filmed using the native Danish language and the second was filmed using the English language. Each version of the film featured the same actors, with the exception of Bodil Miller, who was replaced by actress Marla Behrens since the Danish actress could not speak English. However, the English version of the film was heavily edited, including altering footage to show Reptilicus vomiting acid saliva, and the actors' voices dubbed over by American International Pictures for its release in the United States.