Polyommatus nivescens, the mother-of-pearl blue, is a species of butterfly in the family Lycaenidae. It is found in Spain. It is a small butterfly is sexual dimorphic. The upperside of the male is very clear, with just a bluish beige reflection bordered by a thin grey line and a marginal line of small grey dots. The female upperside is brown, decorated with a marginal line of large orange maculae bordering the hindwings and part of the forewings. Both have a white fringe. 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.