Plagiomnium is a genus of mosses in the family Mniaceae.

[1] It was formerly a part of a more encompassing genus Mnium and in 1968 Finnish bryologist Timo Juhani Koponen justified splitting the genus into a number of smaller genera.

[2] This genus is characterized by singly placed marginal teeth.

[3][4] Plagiomnium are commonly found along shaded stream banks, seeps and springs, generally on soil with a high humus content.

The genus Plagiomnium contains the following species:[5]