The Deori people are one of the major Tibeto-Burmese ethnic group of the Northeast Indian states of Assam and Arunachal Pradesh.

They historically lived in the area of Sadiya, Joidaam, Patkai foothills and in the upper plains or also called as the hinterland of the Brahmaputra Valley.

As per the folklore of the Deori people, they are settlers of the area of Joidaam and Patkai foothills and upper valley of Brahmaputra.

Recorded Data and songs from the people dates back them as an early settlers in Sadiya where their oldest and most sacred temple is situated.

A preliminary investigation from 30 September to 5 October under the aegis of Jimachaya Giyan Aru Juktibadi Samaj has given a positive indication of the presence of Deori people in Kachin province and near Yangon in Myanmar.

The other main deities worshipped by the people are Pisa-dema (the eldest son) also known as Baliya-baba or Baliya-hemta and Pishasi (the daughter) also known as Tamreswari or Kechakati.

The Deori ethnic group are mainly divided into four clans, namely Dibongia, Borgoya, Tengaponiya and Pator-goya.

Some of the commonly known sub-clans are like Ariya, Kumota, Bihiya, Naroda, Sundhariya, Patriya, Dupiya, Marangya, Chariya, Lagasu, Chitiga, Meheda, Kuliya, Khutiya/Buruk, Machiya, Bikomiya, Phaporiya, Fagimegia, Senaboriya, Chakucharu, Ekacharul/Busaru, Simocharu, Hizaru, Popharu, Gucharu etc.