Klackenbergia is a genus of flowering plants belonging to the gentian family (Gentianaceae) and the tribe Exaceae.

[1] It only contains two species, both endemic to Madagascar.

They are notable for their inflorescence with characteristic long bracts and bracteoles and sub-sessile flowers arranged in axillary fascicules at each node.

[2] The genus is named after Jens Klackenberg (1951-).

[3]