Parmastomyces is a genus of fungi in the family Fomitopsidaceae.

The genus was circumscribed by Czech mycologists František Kotlaba and Zdenek Pouzar in 1964, with Tyromyces kravtzevianus Bondartzev & Parm.

Parmastomyces species cause a brown rot.

[1] The genus name of Parmastomyces is in honour of Erast Parmasto (1928–2012), who was an Estonian mycologist, bio-scientist and botanist and onetime director of the Estonian Institute of Zoology and Botany.

[2] The genus was circumscribed by Paul Claude Silva in Taxon vol.8 on page 63 in 1959.