Lowland areas of north-eastern Bolivia (eastern Pando, eastern La Paz, eastern Cochabamba, Beni, Santa Cruz), adjacent Brazil (eastern Rondônia, south-western Mato Grosso) and extreme north-eastern Paraguay.
 
Population
Estimated population is unknown (2010).
Fawn-breasted Wren (Cantorchilus guarayanus) [XC443427]
by JAYRSON ARAUJO DE OLIVEIRA from Santa Cruz de la Sierra Botanical Garden (near Santa Cruz de la Sierra), Provincia de Andr\u00e9s Ib\u00e1\u00f1ez, Departamento de Santa Cruz, Bolivia (call)
Fawn-breasted Wren (Cantorchilus guarayanus) [XC595343]
by GABRIEL LEITE from Estaci\u00f3n Biol\u00f3gica del Beni, Santa Ana, Yacuma, Beni Department, Bolivia (call, song)
Subspecies
No subspecies.
Forms a superspecies with Buff-breasted Wren (Cantorchilus leucotis), Superciliated Wren (Cantorchilus superciliaris) and Long-billed Wren (Cantorchilus longirostris) and sometimes regarded as conspecific with Buff-breasted Wren (Cantorchilus leucotis), although vocalizations quite distinct.