Aricia anteros, the blue argus, is a European butterfly in the family Lycaenidae.

In Europe it can be found in Macedonia, Albania, Greece, Bulgaria, Serbia, Croatia, Montenegro, Bosnia and Herzegovina, Romania, Ukraine and in Turkey.

[1] The males dusted with a very bright metallic blue as far as the narrow black margin, with a small but distinct discocellular spot on the forewing.

Male resembling astrarche above, the female on both sides, but the underside with more prominent and larger spots, the discal row of ocelli on the forewing more curved.

European specimens bear often some small red spots on the upperside of the hindwing before the outer margin; this is ab.