Geminella minor is a species of filamentous freshwater green alga in the family Chlorellaceae.

[4] The type specimen came from Switzerland[5][6] and the species has been reported in the British Isles[4] and elsewhere in the northern hemisphere, including Japan, Ukraine and North America.

[7] Geminella consists of chains of cells (termed filaments) in a contiguous row.

The cells are embedded in a mucilaginous sheath that is about 8–18 μm wide.

The chloroplast fills part of the cell and has pyrenoids.