Lower Dibang Valley is a district located in the state of Arunachal Pradesh, India. It is situated in the eastern part of the state and is known for its scenic beauty and rich biodiversity. The district is named after the Dibang River, which flows through its territory.

Lower Dibang Valley district is bordered by the districts of Lohit to the north, Dibang Valley to the east, and East Siang to the west. It shares its southern boundary with the state of Assam. The district headquarters is located in the town of Roing.