Erysichton lineata, the hairy line blue, is a butterfly in the Lycaenidae family. It is found in New Guinea and along most of the eastern coast of Australia, from Queensland to New South Wales. The wingspan is about 20 mm. Adult females are brown with a large white patch on each forewing, and a blue sheen near the hinges. The hindwings have a black eye-spot at the tornus. Adult males are blue. The larvae feed on the flowers of Syzygium francisii, Ehretia acuminata, Macadamia integrifolia, Brachychiton acerifolium and Arytera lautereriana.