The Pearly Wood-Nymph (Eudryas unio) is a species of moth of the Noctuidae family. It is found in most of the eastern United States from central New Hampshire and southern Ontario, south to southern Florida. In the west it ranges to the eastern Great Plains, south to southern Texas and Veracruz along the eastern coast of Mexico. There are isolated populations in central Utah and California. The California population might be considered a distinct subspecies or even species, brevipennis. The wingspan is 26–35 mm. Adults are on wing from May to August.