Nemoria mimosaria, the white-fringed emerald or flanged looper, is a moth of the family Geometridae. It is found from Nova Scotia to south-eastern Alberta, south to Virginia, Illinois, and Texas. The wingspan is about 26 mm. Adults are on wing from mid to late June. The larvae feed on various deciduous shrubs and trees and conifer trees, including Betula papyrifera, Abies balsamifera, Salix, Alnus, and Myrica asplenifolia.