The article analyzes the formulation, legitimation, and implementation of a policy with an ethnic/race approach by the Pan American Health Organization (PAHO). The study includes the emergence of the theme within this international organization, the institutional dynamics related to it, and the proposals focused on the Black population in Latin America. These issues are discussed on the basis of interaction between PAHO and a range of intergovernmental agencies and private organizations working in the international health domain. Participation by PAHO in the ethnic/racial theme provides elements for understanding the dual role played by intergovernmental organizations in the new global scenario, as both social actors and arenas. As an important social actor in the international health field, PAHO has produced and disseminated values and guidelines related to the ethnic/racial theme. As an arena, the organization has proven open to various interests, seeking to work harmoniously with them through its internal administration.