Borbo ferruginea, the ferruginous swift, ferrous swift or ferrous skipper, is a butterfly of the Hesperiidae family. It is found in southern and south-eastern Africa, in South Africa and from Mozambique to Kenya. In South Africa it is restricted to the lowland forests of KwaZulu-Natal. The habitat consists of coastal forests. The wingspan is 36–39 mm for males and 42–45 mm for females. Adults are probably on wing year round, but it is more from October to May in southern Africa.