Syllepte vagans, the leaden pearl, is a moth in the Crambidae family. It was described by Tutt in 1890. It is found in South Africa, Botswana, the Democratic Republic of Congo, Kenya, Mozambique, Namibia, Nigeria, Tanzania, Zambia and Zimbabwe. It is recorded infrequently in the Great Britain through accidental import. The wingspan is 23–26 mm.