Improving Access to Essential Medicines for Mental, Neurological, and Substance Use Disorders in Sub-Saharan Africa is the summary of a workshop convened by the Institute of Medicine Neuroscience Forum in January 2014 in Addis Ababa, Ethiopia to discuss opportunities for achieving long-term affordable access to medicines for these disorders. This report examines challenges and opportunities for improving access to essential medicines in four critical areas: demand, selection, supply chains, and financing and pricing. The report also discusses successful activities that increase access to essential medicines both within Sub-Saharan Africa and in other developing countries, and considers the role of governments, nongovernmental organizations, and private groups in procurement of essential medicines for mental, neurological, and substance use disorders.