Periya Idathu Penn is a 1963 Indian Tamil-language romantic comedy film directed by T. R. Ramanna.
The film stars M. G. Ramachandran, B. Saroja Devi, M. R. Radha and T. R. Rajakumari.
It tells the story of Murugappan, a small-time farm labourer who lives with his widowed elder sister Gangamma in a village, where he clashes with the arrogant children of the zamindar, Kaïlasam Pillaival.
The film was released on 10 May 1963 and became a blockbuster, running more than 100 days. It was remade in Telugu as Sabhash Suri and in Hindi as Jawab, and inspired the story of the 1982 Tamil film Sakalakala Vallavan.