Iruttinte Athmavu (transl. The soul of Darkness) is a 1967 Indian Malayalam-language film directed by P. Bhaskaran and written by M. T. Vasudevan Nair based on his own short story of the same name. It stars Prem Nazir and Sharada in lead roles with Thikkurissy Sukumaran Nair, P. J. Antony, Ushakumari, Kozhikode Shantha Devi and Baby Rajani in supporting roles. The film is about a mentally unstable youth born into a matriarchal family who is forced to live as a mad man in chains and who is misunderstood and ill-treated by everyone except his uncle's daughter. The film features music by M. S. Baburaj, cinematography by E. N. Balakrishnan and editing by G. Venkitaraman and Das.