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

Each of these viruses has been isolated from Aedes, Anopheles and Culex mosquito populations, but only BAV has been shown to cause infection in humans, in which the symptoms are similar to Japanese encephalitis—fever, malaise and encephalitis.

[3] The word seadornavirus is an portmanteau, meaning Southeast Asian dodeca RNA virus.

The following three species are assigned to the genus:[2] Viruses in Seadornavirus 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.