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) [XC700652]
by Andr\u00e1s Schmidt from Kinkiizi (near Kitahulira), Wilaya ya Kanungu, Mkoa wa Magharibi, Uganda (alarm call, song)
Grauer's Warbler (Graueria vittata) [XC237043]
by Martin St-Michel from Mubwindi trail, Ruhija, Bwindi Impenetrable Forest, Uganda (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.