Woh Kaun Thi? is a 1964 Indian Hindi-language mystery thriller film directed by Raj Khosla, starring Sadhana, Manoj Kumar and Prem Chopra. Though the screenplay was written by Dhruva Chatterjee, parts were later rewritten, wherein Manoj Kumar took an active role. Madan Mohan rendered the music for this movie. The film was a box-office hit. Its success had Khosla directing Sadhana in two more suspense thrillers: Mera Saaya (1966) and Anita (1967).