The Brown-line Sapphire (Iolaus alienus) is a butterfly of the Lycaenidae family. It is found in most of sub-Saharan Africa. The wingspan is 33–37 mm for males and 35–40 mm for females. Adults are on wing from August to November (with a peak in September) and sometimes again from April to May in South Africa. There are two generations per year. Larvae have been reported on Loranthus species. The larvae of ssp. alienus feed on Tapinanthus brunneus, Tapinanthus subulatus, Oliverella rubroviridis and Helixanthera kirkii.