Nishi is a Sino-Tibetan language of the Tani branch spoken in lower Subansiri and East Kameng districts of Arunachal Pradesh and Darrang District of Assam in India. According to 1991 census of India the population of the Nishi speakers is 173,791. The total population of Nishi speakers as per 1997 database is 261,000 including 37,300 Tagins. Though there are plenty of variations across regions, the dialects of Nishi, such as Tagin, are easily mutually intelligible. 'Nisi' is sometimes used as a cover term for western Tani languages.