Arhopala madytus, the bright oakblue, is a butterfly of the family Lycaenidae.

[3][2][4] It is found on New Guinea and adjacent islands (Aru, Ambon, Waigeu, from Western New Guinea to Papua, Woodlark and the Louisiades) and the north-east coast of Queensland, Australia.

[1] Similar to Arhopala meander but above lighter bluish-violet.

Beneath particularly the forewing shows dark longitudinal stripes on the hoary whitish-grey ground.

[5] The larvae feed on Terminalia catappa, T. melanocarpa, T. sericocarpa and Hibiscus tiliaceus.