Microcystaceae is family of cyanobacteria which contains the harmful algal bloom Microcystis aeruginosa.
The family is characterized by single, floating cells or colonies which are embedded to a matrix. There is also a lack of differentiation between apical and basal structures.
The following genera are accepted within Microcystaceae:
Phylogeny per GTDB Release 10-RS226 (April 2025).