Uranothauma nubifer, the black heart or black-heart branded blue, is a butterfly of the family Lycaenidae. It is found from Ethiopia to South Africa. It is also found in eastern Democratic Republic of the Congo.
The wingspan is 22âÂÂ26 mm for males and 24âÂÂ28 mm for females. Adults are on wing year-round, with a peak from November to February.
The larvae feed on Acacia species, including A. karroo.