A synopsis of the Cis Latreille, 1796 from southern Africa is provided, with the description of 10 new species: Cis bicaesariatus sp. n., Cis foveocephalus sp. n., Cis grobbelaarae sp. n., Cis lacinipennis sp. n., Cis makrosoma sp. n., Cis mpumalangaensis sp. n., Cis parvisetosus sp. n., Cis tessariplacus sp. n., Cis umlalaziensis sp. n. and Cis westerncapensis sp. n. The introduced species Cis fuscipes Mellié, 1849 is recorded for the first time from the Republic of South Africa. New geographic records are provided for the following species: Cis neserorum Souza-Gonçalves & Lopes-Andrade, 2017; Cis regius Orsetti & Lopes-Andrade, 2016 and Cis stalsi Souza-Gonçalves & Lopes-Andrade, 2017. Most southern African Cis are placed in available or newly proposed species-groups and a provisional identification key is provided.