Moodu Pani is a 1980 Indian Tamil-language psychological thriller film written, directed and filmed by Balu Mahendra. Starring his then wife Shoba and Pratap, with N. Viswanathan, Gandhimathi, Mohan and Bhanu Chander in supporting roles, it is based on two novels: Idhuvum Oru Viduthalai Thaan (1978) by Rajendra Kumar, and The Collector (1963) by John Fowles. The film follows Chandru (Pratap), who has a strong hatred towards prostitutes and would kill any such woman he encounters. He falls in love with Rekha (Shoba) and believes marrying her will end his psychological distress.