The Least Black Arches (Nola confusalis) is a moth of the Nolidae family. It is found in most of Europe, east to eastern Asia and Japan. The wingspan is 16–18 mm. Adults are on wing from mid April to mid June in one generation in western Europe. The larvae mainly feed on various deciduous trees and bushes, including Tilia and Quercus ilex. Larvae can be found from June to August. Pupation takes place in a cocoon attached to the host plant. The species overwinters in the pupal stage.