As part of an interdisciplinary project on biodiversity (BIOTA South), basic data on small mammal diversity and reproduction from three sampling periods along a transect covering a rainfall gradient in Namibia are presented. A total of 16 species (350 specimens) of Soricidae, Rodentia, and Macroscelidea were captured. Small mammal diversity was highest in the farming area north of Windhoek, whereas it was low in an overgrazed site in the drier south. Reproductive data supports seasonality of reproduction after the rainfall in the north of Namibia but not in the southern sites. Keywords: Small mammal diversity, reproduction, Soricidae, Rodentia, Macroscelidea, semi-arid environments, Namibia.