The green warbler-finch (Certhidea olivacea) is a species of bird, one of Darwin's finches in the tanager family Thraupidae.

When Darwin collected it in 1835 during the Beagle survey expedition he mistakenly thought it was a wren, but on return to England he was informed in March 1837 by the ornithologist John Gould that the bird was in the group of finches.

With its slender, pointed beak adapted for capturing insects, the green warbler-finch occupies a unique ecological niche within the Galápagos archipelago.

As such, the green warbler-finch serves as a crucial species for understanding the evolutionary processes that have shaped the remarkable avian diversity found in this iconic ecosystem.

Green warbler-finches have a greenish coloration to blend into their lusher semi-humid forest habitats, as well as distinctive reddish throat patches on breeding males.

[6] The green warbler-finch consists of only one subspecies, the nominate olivacea, from Santiago, Rábida, Pinzón, Isabela, Fernandina, and Santa Cruz.