Murattu Kaalai (transl. Raging Bull) 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.