Propelled by increased global access to Highly Active Anti-Retroviral Therapies, the integration of HIV treatment and prevention has emerged as an important organizing concept of pandemic response. Despite its potential significance for community-based AIDS organizations (CBAOs) little research on integration has been done from a community-based perspective. This paper responds to that gap in the literature. With a view to moving what can be an abstract concept to the level of concrete practice, we offer a community-based model of the integration of HIV treatment and prevention. The model is based on research conducted in 2006-2007 with front-line staff from CBAOs across Canada carried out in partnership with the Canadian AIDS Treatment Information Exchange. The model is grounded in three central dimensions of a community-based perspective on integration deriving from our research: the phenomenological primacy of front-line service work, a comprehensive notion of treatment and prevention, and the importance of social context. The model is intended as a conceptual resource that can assist CBAOs in formulating practical responses to new demands for integrated service provision.