Changlang district is located in the state of Arunachal Pradesh, India. It is one of the administrative districts in the easternmost part of the state.

Changlang district is situated in the southeastern part of Arunachal Pradesh. It shares its borders with Myanmar (Burma) to the east, Tirap district to the north, and the state of Assam to the south. The major communities residing in the district include Tangsas, Singphos, Noctes, Lisus, and other tribes.