Sphagnum girgensohnii, commonly known as Girgensohn's bogmoss, Girgensohn's sphagnum or common green peat moss, is a species of peat moss with a Holarctic and Indo-Malesian distribution. First described by Edmund Russow in 1865, it is a relatively robust moss species characterised by its green to straw-coloured appearance and distinctive branching pattern. The species typically grows in shaded, damp woodlands and on the edges of mires, forming loose mats particularly under birch and willow trees, and can be found from sea level to elevations of 2,200 m (7,200 ft). While it shows a mainly northern distribution pattern and is especially abundant in subarctic regions, it occurs throughout Europe from Portugal to Russia, being more common in upland areas. Despite facing threats from habitat degradation and land-use changes, S. girgensohnii is assessed by the IUCN as Least Concern due to its extensive range and stable populations, though it receives legal protection under various national and international frameworks, including the EU Habitats Directive.

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