Mandagapattu Tirumurti Temple is a Hindu temple situated in the village of Mandagapattu in the Viluppuram district of Tamil Nadu, India. Hewn from rock by the Pallava ruler Mahendravarman I in honour of the trinity Brahma-Shiva-Vishnu, the rock-cut cave temple is the oldest stone shrine discovered and dated in Tamil Nadu. The temple is notable for the earliest known rock-cut Sanskrit inscription written in Grantha script. It is attributed to the Pallava king Mahendravarman I.