Arhopala curiosa, the curious oakblue, is a butterfly in the family Lycaenidae. It was described by William Harry Evans in 1957. It is found in western Bhutan and Eaglenest Wildlife Sanctuary. This species is monotypic.
The upperside is purple blue with a black border of 4 millimeters. The underside is reddish-brown, with a slight purplish tinge. It has a weird wing shape, close to that of Mahathala butterflies.