Three new species in the genus Niambia are described from southern African caves: N. botswanaensis sp. nov. from Diviner’s Cave (Botswana), N. ghaubensis sp. nov. from Ghaub Cave and N. namibiaensis sp. nov. from Märchen Cave (Namibia). All these species show troglomorphic traits such as absence of body pigmentation and eyes. These are the first troglobitic species recorded in the genus. Most of the other species of Niambia are epigean and occur in semi-arid environments in the Afrotropical Region. Keywords Afrotropical Region, Cave fauna, new species, Platyarthridae.