The western alpine mannikin (Lonchura montana) also known as Snow Mountain mannikin or western alpine munia is a small, approximately 11.5 cm long, estrildid finch.

Both sexes are similar with dark brown plumage, black face, buff chest and black-barred white abdomen.

The young has black bill, dark brown plumage and buffy-white below.

Endemic to Indonesia, the western alpine mannikin is distributed in alpine grassland of the Snow Mountains and Star Mountains in western New Guinea.

A common species in its limited habitat range, the western alpine mannikin is evaluated as being of least concern on the IUCN Red List of Threatened Species.