The spot-tailed antwren (Herpsilochmus sticturus) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

Adult females have a black crown with rufous-cinnamon streaks, buffy edges on the flight feathers, and paler, buff-tinged, underparts than males.

It forages singly, in pairs, and in family groups, and often as a member of a mixed-species feeding flock.

It forages actively and usually captures prey by gleaning leaves, stems, and vines by reaching from a perch.

The spot-tailed antwren's song is a "short, very high, staccato series changing to a rattle" whose first few notes slightly rise.

[5] Its calls include a repeated "sharply downslurred 'chut' " and an "abrupt...muffled whistle, mostly upslurred".