Thirteen Afrotropical species of the ichneumonid genus Diaparsis are recognised (including one species from Seychelles and one species from Reunion). Eleven new species are described from Gabon, Tanzania, South Africa and Uganda: D. abstata sp. n., D. aneucliformis sp. n., D. interstitialis sp. n., D. inusitata sp. n., D. kolyadai sp. n., D. minuscula sp. n., D. mostovskii sp. n., D. probleformis sp. n., D. robusta sp. n., D. voluptuosa sp. n. and D. vulgaris sp. n. Two previously known species, D. evanescens (Morley, 1912) and D. moesta (Holmgren, 1868), are re-described following re-examination of their types. The latter species is found to belong to the genus Tersilochus Holmgren, 1859 (subgenus Tersilochus s. str.), in which it was originally described. An identification key to 13 Afrotropical species of Diaparsis is provided.