Bolivia, Brazil (B), Colombia (B), Costa Rica (B), Ecuador (B), Panama (B), Peru (B).
Caribbean slope of Costa Rica and west-central Panama; also from south-western and west-central Colombia southern on both sides of Andes, in west to north-western Ecuador and in east to north-eastern Peru, extreme western Brazil and northern Bolivia.
 
Population
Estimated population is unknown (2010).
Lanceolated Monklet (Micromonacha lanceolata) [XC364172]
by David Monroy Rengifo from Napo: Guaponi (Gareno) Lodge', 76 road km E of Puerto Napo, right bank of R\u00edo Napo, Ecuador (song)
Lanceolated Monklet (Micromonacha lanceolata) [XC46946]
by Andrew Spencer from Entraz Trail, Villa Rica, Pasco, Peru (song)
Subspecies
Birds from Costa Rica to western Panama named as subspecies austinsmithi, but characters weak and inconstant.