Colostygia multistrigaria, the mottled grey, is a species of moth in the family Geometridae. It is found in western and south-western Europe and North Africa. The wingspan is 26–31 mm. The ground colour is grey mottled with brown. The forewings have a weak central band. The hindwings are pale whitish grey. Adults are on wing from March to April in one generation per year. The larvae feed on Galium species. Larvae can be found from March to June. The species overwinters in the pupal stage.