Sathyamangalam is a town and municipality in Erode district in the Indian state of Tamil Nadu. It lies on the banks of the Bhavani river, a tributary of the Cauvery in the foothills of the Western Ghats and is the headquarters of Sathyamangalam taluk. It is about 65 km from Erode, 58 km from Tiruppur and 65 km from Coimbatore. As of 2011, the town had a population of 37,816.