Ghana and Ethiopia

Klaas's Cuckoo is distributed in Africa south of the Sahara from Senegal to Sudan and South Africa. It is a seasonal migrant to the north and south of its range moving with the rains. There is a distribution map at Birdlife International.

A brood parasite it parasitises warblers, sunbirds, flycatchers and white-eyes.

The French collector, Levaillant, named the bird after his native servant.

A common song is a couple of plaintive whistles often repeated three times in a row and sometimes rendered as "who is he?"