Manichitrathazhu (transl. The Ornate Lock) is a 1993 Indian Malayalam-language epic psychological horror film directed by Fazil, written by Madhu Muttam, and produced by Swargachitra Appachan. The film stars Shobana with Mohanlal and Suresh Gopi in addition to Nedumudi Venu, Innocent, Vinaya Prasad, K.P.A.C.Lalitha, Sridhar, K.B. Ganesh Kumar, Sudheesh, Thilakan and others in supporting roles. The story is inspired by a tragedy that happened in an Ezhava tharavad, the Alummoottil meda (an old traditional mansion), located at Muttom (near Haripad), belonging to a central Travancore Channar family, in the 19th century. The writer of the film, Madhu K Panicker or Madhu Muttam, is a member of the Alummoottil Tharavad.Directors Sibi Malayil, Priyadarshan and Siddique–Lal served as the second-unit directors. The cinematography was by Venu, Anandakuttan and Sunny Joseph served as the second-unit cinematographers, the film was edited by T. R. Shekar. The original songs featured in the movie were composed by M. G. Radhakrishnan, while the original score was composed by Johnson. The film won the National Film Award for Best Popular Film Providing Wholesome Entertainment and Shobhana was awarded the National Film Award for Best Actress for her portrayal of Ganga / Nagavalli.

The film dealt with an unusual theme which was not common in Indian cinema at the time. The film completed 300 days of run in many theatres. Manichitrathazhu was remade in four languages – in Kannada as Apthamitra which in turn was remade in Tamil as Chandramukhi (with some plot changes), in Bengali as Rajmohol and in Hindi as Bhool Bhulaiyaa – all being commercially successful. Geethaanjali, a spin-off directed by Priyadarshan and Mohanlal reprising the role of Dr. Sunny Joseph was made in 2013. Manichitrathazhu is considered by many critics as one of the best films ever made in Malayalam cinema and developed a cult following in the years after its release.