South Tripura () is an administrative district in the state of Tripura in northeastern India. The district occupies an area of 2152 km² and has a population of 762,565 (as of 2001). The district came into existence on 1 September 1970, when the entire state was divided in to three districts. The district headquarters are located at Udaipur. It is around 48 km from the state capital, Agartala. Udaipur is famous for the historic Matabari Temple. Also known as the city of lakes, it is an avid tourist destination.
District has five sub divisions (Udaipur, Amarpur, Belonia, Sabroom and Santirbazar). Tirthmukh another pilgrimage centre is also located in this district in Amarpur Sub Division.