Mimoreovirus is a genus of viruses, in the family Reoviridae, in the subfamily Sedoreovirinae.

The only isolate infects the marine photosynthetic protist Micromonas pusilla, a prasinophyte.

[2][3] Viruses in Mimoreovirus are non-enveloped, with icosahedral geometries, and T=13, T=2 symmetry.

The virus exits the host cell by monopartite non-tubule guided viral movement.

Marine photosynthetic protists serve as the natural host.