Fog) is a 1964 Indian Hindi-language horror thriller film directed by Biren Nag, starring Waheeda Rehman, Biswajeet and Lalita Pawar.

Rajeshwari learns from servants about Amit's first wife Poonam who died in mysterious circumstances about a year ago.

[6] He had been art director of Guru Dutt productions such as Chaudhvin Ka Chand (1960), Sahib Bibi Aur Ghulam (1962) and CID (1956).

[7] The scene of the first wife's room, an all white set was built at Rajkamal Kalamandir in Mumbai.

[7] The song, "Raah bani khud manzil" was filmed on winding road to Mahabaleshwar, a hill station in Maharashtra.