The long-winged antwren (Myrmotherula longipennis) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

[2] It is found in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela.

[3] The long-winged antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Myrmotherula longipennis.

Their throat and upper breast are black; the rest of their underparts are a paler gray than the upperparts.

Adult females have an ochraceous face, olive-brown upperparts, and dark grayish brown tail and wings.

[6][7][8][9] Males of the other subspecies of the long-winged antwren all have white tips on their facial feathers, and more black on the breast and slightly paler though variable underparts than the nominate.

Its known nests were a deep cup of fungal fibers covered with dead leaves; they were hung from a branch at various heights above the ground up to about 12 m (40 ft).

The most common call is "2–6 whistles, dropping in pitch, the number and length of notes variable among races and individuals".