| genus = Athyrium
| species = medium
| authority = (Carmich.) T.Moore
| synonyms =
}}Athyrium medium is a species of fern in the Athyriaceae family. It is found in Tristan da Cunha. Its natural habitat is subantarctic shrubland.
References
{{Taxonbar|from=Q4815741}}{{TristandaCunha-stub}}{{fern-stub}} 4 : Athyrium|Least concern plants|Flora of Tristan da Cunha|Taxonomy articles created by Polbot