Mahi Bajaj Sagar Dam is a dam across the Mahi River. It is situated 16 kilometres from Banswara town in Banswara district Rajasthan, India. The dam was constructed between 1972 and 1983 for the purposes of hydroelectric power generation and water supply. It is the longest dam and second largest dam in Rajasthan. It is named after Jamnalal Bajaj. It is the biggest multipurpose project for tribal area of Rajasthan.