Poneracantha is a genus of ants in the subfamily Ectatomminae. They are found in Central America, the Caribbean, and Central America. One species, Poneracantha triangularis, is invasive to the southeastern United States. The genus was synonymized under Gnamptogenys for a long time, however Camacho et al. 2022 reinstated the validity of this genus.
As of 2024, Poneracantha contains 19 valid species, of which one, Poneracantha brunoi, is extinct.