Rathnagiri Rahasya is a 1957 Indian Kannada-language adventure film, directed and produced by B. R. Panthulu, starring Udaykumar and Jamuna. it was simultaneously made in Tamil as Thangamalai Ragasiyam, which was also released in 1957, with Jamuna reprising her role. Most of the technical crew worked on both the Tamil and Kannada versions of the film.