Arhopala baluensis is a butterfly in the family Lycaenidae. It was described by George Thomas Bethune-Baker in 1904. It is found in the Indomalayan realm (Borneo).
The male is dark blue with a dark border 1/mm wide. The female is shining purple-blue, border 3 mm. at apex to I or 2 mm. at dorsum and on the hindwing.