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) [XC826956]
by id from Mata de Dr. Mauro, Brazil (song)
Streak-capped Antwren (Terenura maculata) [XC592736]
by Marcelo J Feliti from Po\u00e7o Preto trail, Igua\u00e7u NP, Parana state, Brazil (duet, 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.