Coelosphaerium is a genus of cyanobacteria belonging to the family Merismopediaceae.

The species of this genus are found in Europe, America and Australia.

Species:

• Coelosphaerium aerugineum Lemmerm.
• Coelosphaerium confertum West & G.S.West
• Coelosphaerium dubium Grunow
• Coelosphaerium evidenter-marginatum M.T.P.Azevedo & Sant'Anna
• Coelosphaerium goetzei Schmdle
• Coelosphaerium kuetzingianum Nägeli
• Coelosphaerium limnicolum Lund
• Coelosphaerium minutissimum Lemmerm.
• Coelosphaerium subarcticum Komárek & Komárk.-Legn.

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