South Africa is burdened by twin epidemics of HIV and tuberculosis (TB) in which men are less likely than their female counterparts to engage with prevention, treatment and care. In some Cape Flats communities in Cape Town, South Africa, the challenge to men is compounded by high levels of gang violence. This study investigates the role of gang violence as a barrier to men's entry and retention in the HIV/TB care cascade. Data for this study drew from six weeks of participant observation and eleven in-depth interviews in Hanover Park, a largely Coloured township of Cape Town. Key findings concerned men's restricted mobility due to gang violence as a result of conflict over gang territory. Men both inside and outside gangs are affected by this violence, with men in gangs, in most cases, being totally cut off from healthcare services. Men in gangs are a key risk population group for both HIV and TB programming. Community-based interventions that address the effects of violence on health services should be designed for the communities on the Cape Flats. Findings could potentially be extrapolated to other settings affected by gang violence, both within South Africa and abroad.