Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Congo [The Democratic Republic of the], Congo [The Democratic Republic of the], Côte dIvoire, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea-bissau, Kenya, Liberia, Malawi, Mali, Mauritania, Mozambique, Namibia, Nigeria, Rwanda, Sâo Tomé e Principe, Senegal, Sierra Leone, Somalia, South Africa, Sudan, Swaziland, Tanzania [United Republic of], Togo, Uganda, Yemen, Zambia, Zimbabwe.
Senegal east to Sudan and Ethiopia and south to South Africa, including Bioko (Fernando Póo); possibly also in south-western Arabia, where status unclear.
 
Population
Estimated population is unknown (2010).
Klaas's Cuckoo (Chrysococcyx klaas) [XC497009]
by Andres Angulo Rubiano from Oldonyo Nyoike, Magadi, Kajiado County, Kenya (song)
Klaas's Cuckoo (Chrysococcyx klaas) [XC502901]
by Derek Solomon from Mbam et Djerem National Park, second camp, forest transect, ecotone savanna-forest, Cameroon (song)
Subspecies
Birds from Arabia were proposed as possible subspecies arabicus.