Murattu Kaalai is a 1980 Indian Tamil-language action film directed by S. P. Muthuraman, and written by Panchu Arunachalam. The film stars Rajinikanth, Rati Agnihotri, Sumalatha and Jaishankar. It revolves around Kaalaiyan, an honourable villager who, despite being wealthy, chooses to live modestly while Sundaravelu, a less honourable man from the neighbouring village, tries to grab Kaalaiyan's land.

S. P. Muthuraman, also referred to as SPM, is an Indian film director who works in the Tamil film industry. He has directed 72 films in Tamil. He was one of the most successful commercial directors in Tamil cinema. Initially he worked mainly with R. Muthuraman, Jaishankar, Sivaji Ganesan and went on to direct successful films with Rajinikanth and Kamal Haasan.