Rhyzobius is a genus in the lady beetle family (Coccinellidae). It belongs to tribe Coccidulini of subfamily Coccidulinae, which is sometimes subsumed in the Coccinellinae as a tribe with the Coccidulini downranked to subtribe. Species of Rhyzobius can be found almost anywhere on Earth. Rhyzobius lophanthae is used for biological pest control in Australia, namely scale insects (Coccoidea).