The bearded tachuri (Polystictus pectoralis) is a Near Threatened species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers.

Their throat and underparts are pale yellowish white with a cinnamon wash on the breast and flanks.

Juveniles have reddish edges on their flight feathers, buffy wing bars, and deeper yellow underparts than adults.

It is found in eastern Bolivia, much of Paraguay, western Uruguay, northern Argentina south to Mendoza, La Pampa and Buenos Aires provinces, and southern Brazil in an area roughly bounded by Mato Grosso, southern Minas Gerais, and Mato Grosso do Sul.

P. p. bogotensis is (or was) found very locally in Colombia's Cundinamarca and Valle del Cauca departments.

It occurs in savanna with scattered shrubs and scrub, tall grassy areas in cerrado, Venezuela's Gran Sabana, and campos rupestres in Brazil.

However, the southernmost population may move north for the austral winter, as the species is known in Bolivia and adjacent Brazil only in that season.

It includes June and July in eastern Colombia and from September to January in Argentina and most of Brazil.

Its nest is an open cup made from grass and other plant fibers, thistle down, and spider web.

The bearded tachuri sings both from a perch and during its flight display, a "very high, thin series of about 3 'see sisi' notes, ending in an odd, low, toneless, very short 'krrak', together as 'see sisi-krrak' ".