The Lower Dibang Valley district is an administrative district in the state of Arunachal Pradesh in northeastern India. It is the tenth least populous district in the country (out of 640).
The area of the present district was an integral part of the Sutiya Kingdom from the 12th to the 16th century. In June 1980, Dibang Valley district was created out of part of Lohit district.On 16 December 2001, Dibang Valley district was bifurcated into Dibang Valley district and Lower Dibang Valley district.
The district headquarters of the district is Roing. Before it was carved out on 16 December 2001, Anini was the district headquarters.
The 2,000-kilometre-long (1,200 mi) proposed Mago-Thingbu to Vijaynagar Arunachal Pradesh Frontier Highway along the McMahon Line, (will intersect with the proposed East-West Industrial Corridor Highway) and will pass through this district, alignment map of which can be seen here and here.
There are two Arunachal Pradesh Legislative Assembly constituencies located in this district: Dambuk and Roing. Both are part of Arunachal East Lok Sabha constituency.
Languages spoken include Idu Mishmi and Adi, an endangered Sino-Tibetan tongue