This Thematic Series on “Climate-Smart Agriculture Technologies in West Africa: learning from the ground AR4D experiences” contains seven papers presented by researchers from four West African countries based on participatory action research conducted since 2012 in the region. These research activities were funded by the CGIAR Research Program on Climate Change Agriculture and Food Security (CCAFS) through a project titled “Developing community-based climate-smart agriculture through participatory action research in CCAFS benchmark sites in West Africa” (see [1]). This research action under the scientific lead of the World Agroforestry Centre (ICRAF) aimed to test and validate, in partnership with rural communities and other stakeholders, scalable climate-smart village models for agricultural development that integrate a range of innovative agricultural risk management strategies. The project also aimed to enable farmers, developers, managers and policy makers for the agriculture sector to develop cost-effective climate-smart agriculture (CSA) options that support local sustainable development and enhance livelihood resilience. It is therefore a response to the challenges (degraded lands, low crop productivity, high level of poverty for rural people, etc.) faced to satisfy the food needs of an increasing population in the face of a changing climate...