Didymoglossum is a tropical genus of ferns in the family Hymenophyllaceae.

[2] The genus is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), but not by some other sources which sink it into a broadly defined Trichomanes.

[1] Its status, like other genera in the subfamily Trichomanoideae, remains disputed.

The Pteridophyte Phylogeny Group classification of 2016 (PPG I) accepts the genus, placing it in the subfamily Hymenophylloideae and saying that there are about 30 species.

[4] D. bimarginatum D. cuspidatum D. fulgens D. kirkii D. lenormandii D. mindorense D. rotundifolium D. chamaedrys D. erosum D. sublimbatum D. ballardianum D. benlii D. ekmanii D. godmanii D. kapplerianum D. membranaceum D. barklyanum D. hymenoides D. kraussii D. reptans D. hildebrandtii D. beaverianum D. liberiense D. tahitense D. beccarianum D. motleyi D. petersii D. gourlianum D. nummularium D. punctatum D. exiguum D. lorencei D. pinnatinervium D. angustifrons D. ovale Subgenus Didymoglossum Ebihara & K.Iwats.