Arhopala myrtha is a butterfly in the family Lycaenidae.

It was described by Otto Staudinger in 1889.

It is found in the Indomalayan realm where it is endemic to Palawan.

represents alitaeus in Palawan; the specimens are small, beneath very regularly marked, the black marginal band of the upper surface near the apex in the male more than 4 mm broad, at the narrowest place (above the tornus) still 2.5 mm broad, in the female even broader.

The upper surface of the male is of a bright ultramarine-blue colour and shows an intense gloss in a certain light.