South Tripura is an administrative district in the state of Tripura in northeastern India.

The district came into existence on 1 September 1970, when the entire state was divided into three districts.

The district occupies an area of 2152 km². The district headquarters are located at Belonia.

According to the 2011 census South Tripura district has a population of 875,144, roughly equal to the nation of Fiji or the US state of Delaware.This gives it a ranking of 471st in India (out of a total of 640).The district has a population density of 286 inhabitants per square kilometre (740/sq mi).Its population growth rate over the decade 2001–2011 was 14.03%.South Tripura has a sex ratio of 957 females for every 1000 males, and a literacy rate of 85.41%.

In 1987, South Tripura district became home to the Trishna Wildlife Sanctuary, which has an area of 195 square kilometres (75 sq mi).It is also home to the Gumti Wildlife Sanctuary, which was established in 1988 and has an area of 390 square kilometres (150 sq mi).