Gymnoderma is a genus of lichen-forming fungi in the family Cladoniaceae. It has three species. The genus was circumscribed by Finnish botanist William Nylander in 1860. Nylander assigned Gymnoderma coccocarpum as the type species in 1869; this species was originally collected from the Himalayas. It occurs throughout southeastern Asia.
Some species once classified in Gymnoderma have since been transferred to other genera. These include: