Thalavattam (transl. Rhythm) is a 1986 Indian Malayalam-language drama film written and directed by Priyadarshan, starring Mohanlal, Lizy, M. G. Soman and Karthika. The film is very loosely based on the 1975 movie One Flew Over the Cuckoo's Nest which was an adaptation of the 1962 novel of the same name by Ken Kesey. The film features songs composed by Raghu Kumar and C. Rajamani, and a score by Johnson. The story follows Vinod, an eccentric new patient at a mental asylum.

The film was remade in Hindi as Kyon Ki (2005) by Priyadarshan and in Tamil as Manasukkul Mathappu (1988) by Robert–Rajasekar.