The buff ermine is a moth of the family Erebidae. It is sometimes placed in the genus Spilosoma. The species was first described by Johann Siegfried Hufnagel in 1766. It is found throughout the temperate belt of the Palearctic region south to northern Turkey, Georgia, Kazakhstan, southern Siberia, eastern Mongolia, Amur Region, China, Korea and Japan.

Spilosoma is a genus of moths in the family Erebidae originally described by John Curtis in 1825. A very heterogeneous group, it is in need of review by the scientific community, as certain species probably need reclassification into their own genera.