Calomnion is a genus of mosses in the family Rhizogoniaceae.

[1] They have been reported from Australia, New Zealand, Polynesia, Melanesia, New Guinea, and eastern Indonesia.

[2][3] The genus was originally placed within its own family, the Calomniaceae, with the genus Nadeaudia.

Nadeudia contained one species, Nadeaudia schistostegiella, which is now considered a synonym for Calomnion schistostegiellum.

[4] Species included in the genus are:[5]