Polyommatus nivescens, the mother-of-pearl blue, is a species of butterfly in the family Lycaenidae.

The female upperside is brown, decorated with a marginal line of large orange maculae bordering the hindwings and part of the forewings.

The underside is light ochre marked with a marginal line of white lunules topped with orange, and adorned with a line of black dots circled in white very marked on the fore.

The upperside of the male is dull grey-violet with a white silky gloss, similar to dolus, menalcas and coridon albicans.

— Larva very similar to that of icarus, dark green, with black head, blackish dorsal line and yellow side-stripe; at each side of the dorsal line yellowish smears.