The Russet Sparrow (Passer rutilans), also called the Cinnamon or Cinnamon Tree Sparrow, is a passerine bird of the sparrow family Passeridae. A chunky little seed-eating bird with a thick bill, it has a body length of 14–15 cm (5.5–5.9 in). Its plumage is mainly warm rufous above and grey below. It exhibits sexual dimorphism, with both sexes having a pattern similar to that of the corresponding sex of House Sparrow. Its vocalisations are sweet and musical chirps, which when strung together form a song.
Three subspecies are recognised, differing chiefly in the yellowness of their underparts. The subspecies rutilans and intensior breed in parts of eastern Asia, where they are usually found in light woodland, and the subspecies cinnamomeus breeds in the Himalayas, where it is usually associated with terrace cultivation. The Russet Sparrow is the typical sparrow of human habitations in towns where the House and Eurasian Tree sparrows are absent. The Russet Sparrow prefers higher altitudes in the southern part of its range, but in the north it breeds by the sea. The Russet Sparrow is known well enough in the Himalayas to have a distinct name in some languages, and is depicted in Japanese art.
This sparrow feeds mainly on the seeds of herbs and grains, but it also eats berries and insects, particularly during the breeding season. This diet makes it a minor pest in agricultural areas, but also a predator of insect pests. While breeding, it is not social, as its nests are dispersed. It forms flocks when not breeding, although it does not associate with other bird species. In some parts of its range, the Russet Sparrow migrates, at least to lower altitudes. Its nest is located in a tree cavity, or a hole in a cliff or building. The male chooses the nest site before finding a mate and uses the nest for courtship display. The typical clutch contains five or six whitish eggs. Both sexes incubate and feed the young.