Here, we introduce a new family of eukaryote-infecting single-stranded (ss) DNA viruses that was created recently by the International Committee on Taxonomy of Viruses (ICTV). The family, named Genomoviridae, contains a single genus, Gemycircularvirus, which currently has one recognized virus species, Sclerotinia gemycircularvirus 1. Sclerotinia sclerotiorum hypovirulence-associated DNA virus 1 (SsHADV-1) is currently the sole representative isolate of the family; however, a great number of SsHADV-1-like ssDNA virus genomes has been sequenced from various environmental, plant- and animal-associated samples, indicating that members of family Genomoviridae are widespread and abundant in the environment.