Chlorococcum is a genus of green algae, in the family Chlorococcaceae.

[2] It can be found in fresh water, but is more commonly found in soil or subaerial habitats (such as growing on tree bark, wood, stones, or plaster).

[3] Chlorococcum consists of spherical cells which are single or sometimes borne in small clusters; when colonial, there is sometimes a thin layer of mucilage.

Cells contain a single cup-shaped, parietal chloroplast with one pyrenoid.

[3] Chlorococcum reproduces by the formation of autospores or zoospores.