In settings of armed conflict, traditional HIV prevention programmes that promote risk avoidance via abstinence and fidelity and risk reduction via condom use and needle exchange are not viable. In such contexts, HIV risk depends less on personal choice than on exposure to physical, emotional and structural violence. War in northern Uganda has created three realities (internally displaced people's camps, night commuters and child abductions) which increase vulnerability to HIV transmission. Based upon this analysis of northern Uganda, we offer a conceptual framework for HIV transmission in conflict settings that recognizes the importance of local and global context in creating vulnerability to HIV infection. This framework is then used to delineate strategies for HIV prevention in northern Uganda, namely the provision of a safe physical environment and access to education, medical and psychological support, and the promotion of conflict resolution strategies and human rights law.