Arhopala avathina, the lunulate yellow oakblue, is a butterfly in the family Lycaenidae. It was discovered by Alexander Steven Corbet in 1941. It is found in Peninsular Malaysia and Indonesia.
It is bright shining blue above, with a one-and-a-half-millimeter border. Subspecies avathina is bluer while neon is more purple.
Three subspecies are recognized: