Bolbitius is a genus of small mushrooms in the family Bolbitiaceae.

The genus Bolbitius is defined as small thin Mycena-like mushrooms, with a hymenoderm pileipellis, a glutinous cap surface, and spores that are brown in deposit.

Spores of mushrooms of this genus are thick-walled, smooth and have a germ pore.

As of June 2015[update], Index Fungorum lists 54 valid species in Bolbitius:[2]