Arhopala hercules (male)
 
Arhopala hercules is a butterfly in the family Lycaenidae. It was described by William Chapman Hewitson in 1862. It is found in the Australasian realm. Arhopala is a very large genus of gossamer-winged butterflies (Lycaenidae). They are the type genus of the tribe Arhopalini. In the relatively wide circumscription used here, it contains over 200 species collectively known as oakblues. They occur from Japan throughout temperate to tropical Asia south and east of the Himalayas to Australia and the Solomon Islands of Melanesia. Like many of their relatives, their caterpillars are attended and protected by ants (myrmecophily). Sexual dichromatism is often prominent in adult oakblues.