Cinereomyces is a genus of resupinate (crust-like) fungi in the family Gelatoporiaceae. The genus was circumscribed by Swiss mycologist Walter Jülich in 1981. Species in the genus have a gray pore surface except for a whitish margin, and skeletal hyphae with gelatinized walls., Index Fungorum accepts two species of Cinereomyces: the type, C. lindbladii, and C. dilutabilis. The latter species was transferred to Cinereomyces from Diplomitoporus in 2016.
Cinereomyces lindbladii is widely distributed, while C. dilutabilis has been recorded from Brazil and Costa Rica.