The green-backed firecrown (Sephanoides sephaniodes) is a hummingbird in the "coquettes", tribe Lesbiini of subfamily Lesbiinae.

The species is sexually dimorphic, with larger, short-billed males, and smaller, longer-billed females.

Juveniles of both sexes have rusty feather edges on the head and their underparts have a cinnamon tone.

An isolated population is found on Robinson Crusoe and Alejandro Selkirk Islands of the Juan Fernández group, some 770 km (420 nmi) off the Chilean coast.

The species inhabits forest edges, plantations of introduced Eucalyptus, clearings, thickets, and gardens.

It nests from Los Lagos all the way to the southern tip of South America in both Chile and adjoining Argentina.

In the non-breeding season it winters in the lowlands of central Argentina as far east as the Atlantic coast.

"[7] The IUCN has assessed the green-backed firecrown as being of Least Concern, though its population size is unknown and believed to be decreasing.