Ratsasan is a 2018 Indian Tamil-language crime thriller film directed by Ram Kumar. The film stars Vishnu Vishal, Amala Paul, and Saravanan, while Kaali Venkat, Vinodhini Vaidyanathan, and Ramdoss play supporting roles. The film features music and a background score composed by Ghibran, cinematography by P. V. Shankar, and editing by San Lokesh. The film tells the story of an aspiring film director who becomes a police officer after his father's death and tries to track down a serial killer.

Vishal Kudawla, known professionally as Vishnu Vishal, is an Indian actor and producer who appears in Tamil film industry. After a brief career in cricket, he started his acting career in the year 2009 playing the lead role in the sports film Vennila Kabadi Kuzhu, winning acclaim for his portrayal. Vishnu won further acclaim for his role in Neerparavai (2012), portraying a fisherman. He rose to fame with the psychological thriller film, Ratsasan (2018).