Sub-Saharan Africa (SSA) has the fastest growing adolescent population in the world. In addition to developmental changes, adolescents in SSA face health and socioeconomic challenges that increase their vulnerability to mental ill-health. This paper is a narrative review of adolescent mental health (AMH) in SSA with a focus on past achievements, current developments, and future directions in the areas of research, practice and policy in the region. We describe the status of AMH in the region, critical factors that negatively impact AMH, and the ways in which research, practice and policy have responded to this need. Depression, anxiety and post-traumatic stress disorders are the most common mental health problems among adolescents in SSA. Intervention development has largely been focused on HIV/AIDS service delivery in school or community programs by non-specialist health workers. There is a severe shortage of specialised AMH services, poor integration of services into primary health care, lack of a coordinated inter-sectoral collaboration, and the absence of clear referral pathways. Policies for the promotion of AMH have been given less attention by policymakers, due to stigma attached to mental health problems, and an insufficient understanding of the link between mental health and social determinants, such as poverty. Given these gaps, traditional healers are the most accessible care available to help-seeking adolescents. Sustained AMH research with a focus on the socioeconomic benefits of implementing evidence-based, contextually adapted psychosocial interventions might prove useful in advocating for much needed policies to improve AMH in SSA.