This mapping study provides an overview of the various ongoing or planned development partner efforts to support security sector reform in Nigeria since 2014. The mapping was jointly undertaken by the German Federal Foreign Office and ISSAT. The report tracks development partner support to all justice and security sector institutions in Nigeria. The elements of support were organized according to four categories: management reform, accountability reforms, capacity building/training and equipment/infrastructure support. Given the resource and time constraints facing the mapping team, the mapping only covered activities and programme interventions for the period of 2014 to 2016. All future programme activities that were identified were detailed under future support.