The white-bearded antshrike (Biatas nigropectus) is a Vulnerable species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

[3] The white-bearded antshrike was described by the French ornithologist Frédéric de Lafresnaye in 1850 and given the binomial name Anabates nigro-pectus.

[4] It was later moved to its current genus Biatas that was erected by the German ornithologists Jean Cabanis and Ferdinand Heine in 1860 with the white-bearded antshrike as the type species.

Females have a rufous-brown crown, a distinct white supercilium, and no black on the throat and breast.

An extensive survey in Misiones, Argentina, found it only in stands of Guadua trinii bamboo.

[7] The white-bearded antshrike's diet has not been fully defined but is known to include insects, spiders, and seeds.

[7] The white-bearded antshrike's breeding season has not been fully defined but in Brazil it appears to span at least October to December.

The white-bearded antshrike's song is a "slow series of 6-8 mournful, yet melodious notes, first rising, then lowering in pitch at the end".

Its Atlantic Forest habitat has been severely depleted by destruction for human settlement, pasture, agriculture, and mining.