Nenjil Oru Mull is a 1981 Indian Tamil-language film written and directed by Mathi Oli Shanmugam. It serves as a remake of the 1971 Hindi film Kati Patang, which itself was adapted from Cornell Woolrich's 1948 novel I Married a Dead Man.
The movie stars Poornima Jayaraman in her debut role alongside Pratap. Other cast members include Sivachandran, Calcutta Viswanathan, V. K. Ramasamy, and Mathioli Shanmugam as Bar Manager.
Principal filming took place primarily in Coimbatore, featuring a notable scene where Poornima Jayaraman runs on an overpass. Cinematography was handled by Ashok Gunjal, editing by R. Devarajan, with music composed by G.K. Venkatesh.
The film was released on 11 December 1981 and marks the first Tamil film for Poornima Bhagyaraj (née Jayaraman).