K. Ramachandra Babu was an Indian cinematographer of over 125 films, out of which most are Malayalam films. He also worked for films in Tamil, Telugu, Hindi, Arabic and English languages. He served as the cinematographer for several documentaries and advertisement films as well. He was the founder of the Indian Society of Cinematographers (ISC).

Nirmalyam is a 1973 Indian Malayalam-language film written and directed by M. T. Vasudevan Nair, and stars P. J. Antony, Sumithra, and Ravi Menon. P. J. Antony won the National Film Award for Best Actor in 1974 for his performance as a velichappadu in this movie. The film received the National Film Award for Best Feature Film and Kerala State Film Award for Best Film in 1974. It is one of the classics in Malayalam cinema. The film was based on M. T. Vasudevan Nair's short story Pallivaalum Kaalchilambum.