This article discusses the lack of research on transgender populations in Africa. There is almost no data on HIV prevalence and risk among transgender people on the continent. Transgender individuals may be invisible in epidemiological data due to criminalization of same-sex behavior and fear of negative repercussions from research. Researchers may also be overlooking or ignoring transgender populations due to confusion about gender identity questions. Without transgender-specific research, it is very difficult to identify appropriate HIV interventions and services for this at-risk group. The article calls for more explicit attention to transgender people in HIV-related research and programs in Africa.