Salamis cacta, the lilac mother-of-pearl or lilac beauty, is a butterfly in the Nymphalidae family. It is found in Senegal, Guinea, Sierra Leone, Liberia, Ivory Coast, Ghana, Togo, Benin, Nigeria, Cameroon, Equatorial Guinea, Gabon, the Republic of Congo, the Central African Republic, Angola, the Democratic Republic of Congo, Uganda, Rwanda, Ethiopia, Kenya, Tanzania, Malawi, Mozambique and Zimbabwe. The habitat consists of forests, including disturbed forest habitats. The larvae feed on Urera hypselodendron, Urera trinervis, and Urera occidentalis.