Thestor penningtoni, the Pennington's skolly, is a butterfly of the family Lycaenidae. It is found in South Africa, where it is known from the Western Cape, from the Swartberg Pass along the Great Swartberg, Elandsberg north of Seweweekspoort, the Keeromsberg and Waboomsberg, as well as the Hex River Mountains.
The wingspan is 26âÂÂ37 mm for males and 32âÂÂ41 mm for females. Adults are on wing from late October to November. There is one generation per year.