South-eastern Brazil (coastal region from south-eastern Bahia south to Santa Catarina, inland locally in southern Minas Gerais, Sío Paulo and Paraná), eastern Paraguay (Canendiyu south to Caazapá) and extreme north-eastern Argentina (Misiones).
 
Population
Estimated population is unknown (2010).
Streak-capped Antwren (Terenura maculata) [XC778190]
by Mateus Gon\u00e7alves Santos from Jequi\u00e9, Bahia, Brazil (song)
Streak-capped Antwren (Terenura maculata) [XC725265]
by Carlos Ferrari from S\u00e3o Francisco do Sul, Estrada Eduardo Ledoux, Santa Catarina, Brazil (song)
Subspecies
Forms a superspecies with Orange-bellied Antwren (Terenura sicki). Further analysis of molecular, vocal and other characteristics that may differentiate them is needed.