Rossouw's Skolly (Thestor rossouwi) is a species of butterfly in the Lycaenidae family. It is endemic to South Africa., where it is known from coastal fynbos from between Riversdale and Stilbaai, west to Hermanus, Cape Agulhas and Bredasdorp in the West Cape. The wingspan is 27–32 mm for males and 30–36 mm for females. Adults are on wing from September to April. There might be more than one generation per year.