Klages's antwren (Myrmotherula klagesi) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

[2] The species' English name and specific epithet commemorate Samuel M. Klages, who collected the first specimen in Santarém, Pará, Brazil.

It inhabits the subcanopy and canopy of lowland várzea and igapó evergreen forest, almost entirely below an elevation of 100 m (300 ft).

It typically forages singly or in pairs and regularly joins mixed-species feeding flocks.

It actively seeks prey among leaves and vine tangles and along branches, gleaning by reaching, lunging, and with brief sallies from a perch.

"The species is predicted to lose 30-59% of its habitat by 2020 due to agriculture, deforestation and hydroelectric dam construction".