Three new viruses classifiable within the Totivirus and Orbivirus genera were detected from Anopheles mosquito species collected in Eastern Australia. The viruses could not be isolated in C6/36 mosquito cell cultures but were shown to replicate in their mosquito hosts by small RNA analysis. The viruses grouped phylogenetically with other viruses recently detected in insects. These discoveries contribute to a better understanding of commensal viruses in Australian mosquitoes and the evolution of these viruses.