Achaea serva is a species of moth of the Noctuidae family. It is found from the Indo-Australian tropics to Okinawa, many western Micronesian islands and New Guinea and Australia.This species has a wingspan of 70-82mm for the males and 62–80 mm for the females.Recorded larval food plants include Buchanania, Ipomoea, Diospyros, Ricinus, Sapindus, Madhuca, Manilkara, Mimusops, Palaquium and Sideroxylon.