Tswa, or XiTswa is a South-Eastern Bantu language in Southern Mozambique. Its closest relatives are Ronga and Tsonga, the three forming the Tswa–Ronga family of languages.

Tswa is mainly spoken in the rural areas west of Inhambane. Its largest dialect, Hlengwe, extends westwards to Southern Zimbabwe. Other dialects include Dzivi, Mhandla and the smaller Nwanati (Makwakwa), south of the Hlengwe and the Nzonge (Gwambe) between the Dzivi and Chopi. According to some estimates, there are just over 1 million BaTswa, but not all can speak the Tswa language. Many Mozambicans, including census officials, often consider it a dialect of 'Shangaan', another term for Tsonga.

Tswa uses a variant of the Latin alphabet previously used for Tsonga. It is partly based on those developed by the Portuguese colonists and Methodist missionaries to the region. The first major transliterator for the Tswa language into English was the Englishman J. A. Persson, who consolidated the alphabet for Tswa specifically.

The letter 'q' is sometimes used in words imported from Zulu, in which case it is pronounced in various ways, the clicks of Zulu not being native to the Tswa language. There are also several compounds, which include lateral fricatives.