Tiwa (Assamese: তিৱা) is an ethnic group/indigenous tribe inhabiting the states of Assam and Meghalaya in Northeast India. They are recognized as a Scheduled tribe within the State of Assam.They were known as Lalungs in the Assamese Buranjis, Colonial literature and in the Constitution of India, though members of the group prefer to call themselves Tiwa (meaning "the people who were lifted from below"). Some of their neighbours still call them Lalung.
A striking peculiarity of the Tiwa is their division into two sub-groups, Hill Tiwa and Plains Tiwas, displaying contrasting cultural features.
The Hill Tiwas live in the westernmost areas of Karbi Anglong district (Assam) as well as in the Northeastern corner of Ri-Bhoi district (Meghalaya). They speak a Tibeto-Burman language of the Bodo-Garo group. They are divided into a dozen of clans recognized by specific names which they use as patronymics. Their descent system can be said to be ambilineal. In most cases, the husband goes to live in her wife's family settlement (matrilocality), and their children are included in their mother's clan. However, in about 30% of unions, the woman comes to live with her husband. In such cases, children take the name of their father. This trend is on the rise under the influence of neighbouring populations which are mostly patrilineal. About one half of Hill Tiwas follow their "traditional" religion. It is based on the worship of local deities. The other half have been converted to Christianity since the 1950s. The Hill Tiwas society is organized around seven old villages which constitute its political as well as ritual centre. Each of them harbours a chief (loro) who performs judicial and religious duties for a network of settlements. Old villages are also characterized by their bachelor dormitory (samadi).