It is found in a wide range of semi-open habitats in south-east Asia, ranging from Myanmar to the Lesser Sundas and west Philippines.

The grey-throated sunbird found in the remaining part of the Philippines is often considered a subspecies of the brown-throated sunbird, but the two differ consistently in measurements and plumage, and there is no evidence of intergradation between them.

Measuring some 14 centimetres (5.5 in) in length, it has a mass of 7.4–13.5 g (0.26–0.48 oz), with males averaging slightly larger than females.

The male has iridescent green and purple upperparts with chestnut on the wing-coverts and scapulars; it is primarily yellow below.

The brown-throated sunbird primarily feeds on nectar, but it will also take small fruits and berries.