Lomanthus is a genus of flowering plant in the family Asteraceae, with species native to northwestern Argentina, Bolivia, Ecuador and Peru.

[1] It was segregated from Senecio on the basis of morphological and molecular phylogenetic evidence.

It is placed in the tribe Senecioneae.

[3] As of March 2023[update], Plants of the World Online accepted the following species:[2]

This Senecioneae-related article is a stub.