Despite global progress in understanding the epidemiology of the human immunodeficiency virus (HIV), knowledge about the epidemic in the Middle East and North Africa (MENA) remains limited and subject to much controversy. In the more than 25 years since the discovery of HIV, no scientific study has provided a comprehensive, data-driven synthesis of the spread of HIV/AIDS (acquired immunodeficiency syndrome) in the region. Consequently, the effectiveness of policies, programs, and resources intended to address the spread of HIV/AIDS has been compromised. This report aims to fill the knowledge gap by providing the first-ever comprehensive scientific assessment and data-driven epidemiological synthesis of HIV's spread in MENA. It is based on a literature review and analysis of thousands of largely unrecognized publications, reports, and data sources extracted from scientific literature or collected from sources at the local, national, and regional levels. The resulting collection of data provides a solid foundation on which efforts to stem the spread of HIV/AIDS can be based. 'Characterizing the HIV/AIDS Epidemic in the Middle East and North Africa' will be of particular interest to policy makers, researchers, development practitioners, and specialists in public health and epidemiology.