Greya piperella is a moth of the family Prodoxidae. In North America it is found from southern British Columbia to central Oregon, west to western Montana. There is an isolated population in central California and the species is possibly also present in New Mexico and Utah. The habitat consists of open, grassy pine forests or rockfaces in open country. The larvae feed on Heuchera cylindrica and Heuchera micrantha. The larvae mine the peduncle of the host plant.