Alsodes igneus is a species of frogs in the family Alsodidae endemic to Chile; it is only known from its type locality, Tolhuaca National Park, Malleco Province, on the western slopes of the Andes.

[3] The specific name igneus, meaning "something that is of fire", was chosen to symbolize the survival of the population from a great forest fire that affected the type locality in 2000.

[2] Male Alsodes igneus measure about 46 mm (1.8 in) in snout–vent length (based on a single male) and females about 59–67 mm (2.3–2.6 in) (based on two females, including the holotype).

The snout is short and slightly truncated in dorsal view.

There is a black ribbon extending below the canthus rostralis; the background colour is khaki.