Angola, Benin, Cameroon, Central African Republic, Congo [The Democratic Republic of the], Congo [The Democratic Republic of the], Côte dIvoire, Equatorial Guinea, Gabon, Ghana, Guinea, Guinea-bissau, Liberia, Nigeria, Sierra Leone, Sudan, Togo, Uganda.
Sierra Leone and south-eastern Guinea east to south-western Ghana and northern Togo, and south-eastern Nigeria east to extreme south-western Sudan (Bengengai) and Uganda, south to extreme north-western and north-eastern Angola (Cabinda, northern Lunda Norte) and central DRCongo.
 
Population
Estimated population is unknown (2010).
Lowland Sooty Boubou (Laniarius leucorhynchus) [XC827844]
by Brendan Sloan from Ntokou, Park headquarters, Congo (Brazzaville) (duet)
Lowland Sooty Boubou (Laniarius leucorhynchus) [XC283325]
by Bram Vogels from Kirimia, Semuliki National Park, Bundibugyo, Western Region, Uganda (call, song)
Subspecies
No subspecies.
Recent DNA analyses indicate that this species may be as closely related to the black-and-scarlet southern African Crimson-breasted Gonolek (Laniarius atrococcineus) as it is to the similarly all-black low-latitude Mountain Boubou (Laniarius poensis), Fuelleborn's Boubou (Laniarius fuelleborni) and Slate-coloured Boubou (Laniarius funebris).