The Guianan gnatcatcher (Polioptila guianensis) is a species of bird in the family Polioptilidae.

[5] The Guianan gnatcatcher is found in the Guianas and adjoining Brazil south to the Amazon River.

[5] The Guianan gnatcatcher's breeding phenology is essentially unknown, but "A male was observed feeding a fledgling on 27 November 1984 in French Guiana".

[5] The IUCN has not assessed the Guianan gnatcatcher separately from the larger species complex that predated the 2019 splits.

[1] "The species’ ecoregion of primary occurrence, Guianan moist forest, not considered to be at serious risk, given its current and projected conservation status.