The Barasingha or Swamp deer (Rucervus duvaucelii) is a deer species currently found in isolated localities in north and central India, and southwestern Nepal, and is extinct in Bangladesh..They are also found in small numbers in parts of Pakistan.[1]

The binomial commemorates the French naturalist Alfred Duvaucel.

The most striking feature of a barasingha is its antlers, with 10 to 14 tines on a mature stag, though some have been known to have up to 20. The name is derived from this characteristic and means 12 tined or horned in Hindi. In Assamese, barasingha is called dolhorina; dol meaning swamp. In Central India it is called goinjak (stags) or gaoni (hinds).

A stag may stand 132 cm (52 in) at the shoulder and weigh 170 to 180 kg (370 to 400 lb). Average antlers may measure 75 cm (30 in) round the curve with a girth of 13 cm (5.1 in) at mid beam. A record antler measured 104.1 cm (41.0 in) round the curve.

Barasinghas used to inhabit the basins of the Indus, Ganges and Brahmaputra rivers, as well as central India as far as the Godavari River. Bones aging over a thousand years have been found in the Langhanj site in Gujarat. Today, barasinghas have disappeared entirely from the western part of their range. In 1964, the total population in India was estimated at 3000 to 4000 individuals.^{[citation needed]}