Sathiyavakku () is a 1990 Indian Tamil-language action thriller film, written and directed by R. Aravindraj. The film stars Prabhu, Shobana, and Ramya Krishnan. It was released on 23 November 1990.
The music was composed by Gyan Varma.
The Indian Express wrote, "the film survives only because of its low-light photography, nicely choreographed suspense sequences [..] and a high decibel background score".