The greater koa finch (Rhodacanthis palmeri) is an extinct species of Hawaiian honeycreeper in the subfamily Carduelinae of the family Fringillidae.

It had a thick black bill which allowed it to break open seed pods that were found in the trees.

In historical times, its range was largely confined to the Kona District of the island of Hawaiʻi, although it was observed in the Kīlauea area in 1895.

[2] Like its close relative the lesser koa finch, this bird lived in small stretches of mesic forest on the Big Island of Hawaiʻi.

Avian pox (Poxvirus avium) and malaria (Plasmodium relictum), spread by mosquitoes, may have also been a factor.