The dull-coloured grassquit (Asemospiza obscura) is a small bird. It is recognized as a tanager closely related to Darwin's finches.
It is found in northwestern Argentina, Bolivia, Colombia, Ecuador, Peru and western Venezuela. It is a vagrant to Paraguay and central Brazil.Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, subtropical or tropical moist shrubland, subtropical or tropical high-altitude shrubland, and heavily degraded former forest.