Neodesmus is a genus of green algae in the family Scenedesmaceae.

[2] Neodesmus consists of colonies of two cells, termed coenobia (plural of coenobium); these coenobia may be further arranged in a structured called a syncoenobium surrounded by a mucilage envelope.

The cells are fusiform to cylindrical, 5 to 9 μm long and arranged obliquely next to each other.

[1] Neodesmus reproduces asexually by forming autospores; two spores are produced per cell.

Sexual reproduction or flagellated life stages have not been observed in Neodesmus.