Alphasatellitidae is a family of single-stranded DNA satellite nucleic acids that depend on the presence of another virus (a helper virus) to replicate their genomes. As such, they have minimal genomes with very low genomic redundancy. The genome is a single circular DNA molecule. The first alphasatellites were described in 1999 and were associated with cotton leaf curl disease and Ageratum yellow vein disease. As begomoviruses are being characterised at the molecular level, an increasing number of alphasatellites are being described.

These viruses were earlier known as DNA 1 components.

These viruses are generally found in the Old World. A number have been isolated from the New World but their association with their host viruses is still being studied.