Ten years of participant-observation fieldwork and photography among a multi-ethnic social network of homeless heroin injectors and crack smokers in California reveal hierarchical interpersonal relations between African Americans, whites and Latinos despite the fact that they all share a physical addiction to heroin and live in abject poverty in the same encampments. Focusing on tensions between blacks and whites, we develop the concept of “ethnicized habitusâ€? to understand how divisions drawn on the basis of skin color are enforced through everyday interaction to produce “intimate apartheidâ€? in the context of physical proximity and shared destitution. Specifically, we examine how two components of ethnic habitus are generated. One is a simple technique of the body, a preference for intravenous versus intramuscular or subcutaneous heroin injection. The second relates to income generation strategies and is more obviously related to external power constraints. Both these components fit into a larger constellation of ethnic distinctions rooted in historically-entrenched political, economic and ideological forces. An understanding of the generative forces of the ethnic dimensions of habitus allows us to recognize how macro power relations produce intimate desires and ways of being to become inscribed on individual bodies and routinized in behavior. These distinctions are for the most part interpreted as natural attributes of genetics and culture by many people in the United States, justifying a racialized moral hierarchy.