Lycaena salustius, the common copper or the coastal copper, is a butterfly of the family Lycaenidae. It is endemic to New Zealand. It is known in the Maori language as pepe para riki, a name that is shared with a few other members of the genus Lycaena native to New Zealand. The wingspan is 24–35 mm. Adults are on wing from October to April. The larvae feed on Muehlenbeckia species.