While African countries are becoming more and more relevant as host countries for suppliers of multinational companies little is known about corporate social responsibility (CSR) in this region. To fill this gap, the present paper explores CSR considerations of foreign affiliates of multinational companies when choosing local African suppliers. The paper suggests a model of three types of determinants, namely firm characteristics, exports, and intra-trade. Analyses of a large-scale and quite unique firm level data for more than 2,000 foreign owned firms in 19 Sub-Saharan African countries demonstrate that firms importing intermediates from their parent company abroad are more likely to implement CSR. Similarly, CSR plays a larger role for affiliates that export to developed countries. Different determinants affect environmental and social CSR activities.