Coenocystis
{{Short description|Genus of algae}}
{{Automatic taxobox
| image = Medeiros_et_al_2021_Coenocystis_subcylindrica.jpg
| image_caption = Coenocystis subcylindrica
| taxon = Coenocystis
| authority = Korshikov
| subdivision_ranks = Species
| subdivision =
}}
Coenocystis is a genus of green algae in the family Radiococcaceae.{{AlgaeBase genus|name=Coenocystis|id=43464}}