This article is about New Zealand species. For the African long-tailed cuckoos, see Cercococcyx.

The Long-tailed Cuckoo (Eudynamys taitensis), also known as the Long-tailed Koel or the Koekoe? in M?ori, is a species of cuckoo in the Cuculidae family. The species breeds in New Zealand, and migrates to the islands of the western Pacific in the winter.

The Long-tailed Cuckoo is a brood parasite, laying its eggs in the nests of Yellowheads, Whiteheads and Brown Creepers. The eggs hatch before those of the host do so and the young chicks eject the eggs of the host. Long-tail Cuckoo chicks are able to mimic the calls of their host's chicks.