Pronephrium is a genus of ferns in the family Thelypteridaceae in the family Thelypteridaceae, subfamily Thelypteridoideae, in the Pteridophyte Phylogeny Group classification of 2016 (PPG I).

[1] Other sources sink Pronephrium into a very broadly defined genus Thelypteris.

[3] Some species were split off into the genera Abacopteris, Grypothrix and Menisciopsis in 2021 as a result of a phylogenetic study of the family Thelypteridaceae.

[4][5] The genus was first described in 1851 by Carl Borivoj Presl.

[6][7] As of June 2022[update], the Checklist of Ferns and Lycophytes of the World accepted the following species and hybrids:[2]