The Acre antshrike (Thamnophilus divisorius) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

Both sexes have a chestnut brown iris and dull bluish gray legs and feet.

[3][5] The Acre antshrike was originally known to occur only in the immediate area of its discovery, the Sierra da Jaquiran in Brazil's Serra do Divisor National Park, though the discovery team expected it to also occur on other ridges with similar habitat in and near the park.

Its range was extended by nearly 100 km (60 mi) with the 2006 discovery of the species in Peru's Ojo de Contaya and Diviso in Zona Reservada Sierra del Divisor, which is part of the same complex of ridges as the discovery site.

Most of the few encounter sites on the two ridges had a dense understory dominated by terrestrial bromeliads.

Whitney et al. observed pairs foraging low to the ground, hopping and hitching on thin branches and vines.

The Acre antshrike's song is "an accelerating, descending series of rich notes with a distinctive, higher pitched, bisyllabic terminal bark: kuk kuk-kuk-kuk-ku-ku-ku-ku'wah'AH".

[7] Whitney et al. noted specific differences between this species' song and those of other Thanomphilus antshrikes.