The Mountain Firetail is a chunky finch of the New Guinea highlands. It occurs along montane forest edges and where subalpine grassland meets shrubland.
It is chunky, with a brown head, back, and wings and a red rump. Males have a yellow-orange bill and reddish belly.
It uses moist montane forest and high-altitude shrubland, including forest edges beside subalpine grassland. BirdLife lists it as resident.
An extinction-risk assessment has not been added yet.