Burundi, Congo [The Democratic Republic of the], Rwanda, Uganda.
Eastern DRCongo (highlands west of L Edward, south to Itombwe), south-western Uganda (Bwindi-Impenetrable Forest) and western Rwanda (Nyungwe Forest).
 
Population
Estimated population is unknown (2010).
Grauer's Warbler (Graueria vittata) [XC667518]
by Magnus Wadstein from Bwindi, Western Region, Uganda (call)
Grauer's Warbler (Graueria vittata) [XC700652]
by Andr\u00e1s Schmidt from Kinkiizi (near Kitahulira), Wilaya ya Kanungu, Mkoa wa Magharibi, Uganda (alarm call, song)
Subspecies
No subspecies.
Affinities uncertain. Often considered close to Macrosphenus, but bill shorter and stronger, a feature which has caused some authors to regard it as a babbler (Timaliidae). Barred underparts and build suggest possible close relationship with Calamonastes, in family Cisticolidae. Further research is required.