Nagin is a 1976 Hindi-language horror film, produced and directed by Rajkumar Kohli, under the Shankar Movies banner. It stars Reena Roy in the title role alongside an ensemble cast, including Sunil Dutt, Feroz Khan, Sanjay Khan, Rekha, Mumtaz, Vinod Mehra, Yogeeta Bali, Kabir Bedi, Anil Dhawan, and Jeetendra; its music was composed by Laxmikant Pyarelal. Despite being a fantasy type film, it was a blockbuster at the box office and the highest-grossing film of 1976. Following the success of the film, Reena Roy attained star status.

Reena Roy, is an Indian actress. She made her film debut as a teenager with B R Ishara's Zaroorat (1972), but gained wider public recognition with Jaise Ko Taisa (1973) and the romance-action film Zakhmee (1975). In 1976, Roy entered the top league after starring in two of the biggest box-office hits, the action thriller Kalicharan and the horror film Nagin. She repeated the feat in 1978 with Vishwanath and Aasha.