Cardoreovirus is a genus of double-stranded RNA viruses in the family Reoviridae and subfamily Sedoreovirinae.

There is only one species in this genus: Eriocheir sinensis reovirus.

The name derives from Latin words "carcinus" which means crab and "doeca" which means twelve in reference to the number genome segments.

[1][2] Viruses in the genus Cardoreovirus are non-enveloped.

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