The Dhansiri is an Indian river of Golaghat District of Assam and the Chümoukedima District and Dimapur District of Nagaland. It originates from Laisang peak of Nagaland. It flows through a distance of 352 kilometres (219 mi) from south to north before joining the Brahmaputra on its south bank. Its total catchment area is 1,220 square kilometres (470 sq mi).

In Ahom Buranjis, it is mentioned as Khe-Nam-Ti-Ma which means A river coming from watery place. (Khe = A river, Nam = Water, Ti = Place, Ma = Coming)

While flowing as the boundary between Karbi Anglong and Nagaland, it flanks a large wilderness very rich in wildlife. On one side is the Dhansiri Reserved Forest and on the other Intanki National Park.

It has several types of important wood bearing trees along its bank like Intanki Forest. Dhansari river along with Kapili by headward erosion has completely isolated the Mikir hills from the Peninsular plateau. There are numerous perennially waterlogged swampy region locally known as bils associated with this river.

A fish survey conducted in 2011-12 found 34 species of fish belonging to five orders, thirteen families and 24 genera. Seventeen species of Cypriniformes were found, followed by eight species of Siluriformes. The Dhansiri river in Dimapur has freshwater, semi torrent, hill stream and ornamental fish species.

• List of rivers of Nagaland

• Source Geography of India (Majid Hussain, TMH)
• Wetlands along the Dhansiri River channel, Assam - A paper by MK Dutta and P Kotoky
• BBC Report:Marching on to Laffan's Plain - Chapter 12 by Alan Shaw
• Xobdo.Org Encyclopaedia entry on Dhansiri
• Nagaland Pollution Control Board's NWMP entry on water quality levels of the Dhansiri River Archived 2 June 2018 at the Wayback Machine

26°40′N 93°45′E / 26.667°N 93.750°E / 26.667; 93.750