Nannochloris is a genus of green algae in the family Chlorellaceae.

[2] Nannochloris consists of very small cells less than 4.5 μm in diameter.

The cells are solitary or paired, subspherical to subcylindrical, and surrounded by layers of mucilage and often found in large groups.

The single chloroplast is parietal and plate-like, at one or both ends, and with one naked pyrenoid.

[2] This green algae-related article is a stub.