Eastern Peru (south of R Amazon, east of R Ucayali), southern Amazonian Brazil (east to lower R Xingu and south to northern Mato Grosso) and north-western and north-eastern Bolivia (Pando, northern La Paz, north-eastern Santa Cruz).
 
Population
Estimated population is unknown (2010).
Sclater's Antwren (Myrmotherula sclateri) [XC22998]
by Andrew Spencer from Primavera Baja, Madre de Dios, Peru (song)
Sclater's Antwren (Myrmotherula sclateri) [XC498690]
by Dante Buzzetti from Sena, Madre De Dios, Departamento de Pando, Bolivia (song)
Subspecies
Forms a superspecies with Yellow-throated Antwren (Myrmotherula ambigua). Genetic and morphological analyses indicate that both species are part of a monophyletic group that also includes Pygmy Antwren (Myrmotherula brachyura), Moustached Antwren (Myrmotherula ignota), Streaked Antwren (Myrmotherula surinamensis), Amazonian Streaked Antwren (Myrmotherula multostriata), Pacific Antwren (Myrmotherula pacifica), Cherrie's Antwren (Myrmotherula cherriei), Klages's Antwren (Myrmotherula klagesi) and Stripe-chested Antwren (Myrmotherula longicauda), (the "streaked antwren assemblage"). Form described as Myrmotherula kermiti ("Kermit's Antwren") was based on variants of present species.