The purpose of this dissertation is to understand the Brazilian position regarding the international norm on humanitarian intervention. In order to achieve this objective, the norm oriented constructivist theory of International Relations will be applied in the analysis of the current Brazilian involvement in the United Nations Stabilization Mission in Haiti (MINUSTAH). The Brazilian involvement is understood from the perspective of the evolution of the international norm on intervention but also taking into consideration the regional normative context. The hypothesis developed in this dissertation identifies two aspects as fundamental for the understanding of the Brazilian involvement in Haiti: first, the framing of the response to the Haitian crisis of 2004 as a regional response, in which Latin American countries, particularly those of the Southern Cone, have taken the leading role; second, the framing of the Brazilian response as guided by an ethical and moral obligation, based on the idea of hemispheric solidarity and on the recognition that both countries share a common cultural heritage, which leads to the principle of non-indifference. Our conclusion suggests that the current South American involvement in MINUSTAH is part of a Brazilian project of strengthening South America, and also that a country’s national interest is not immutable, but socially constructed, and as such it can include a concern for the protection of human rights of those located outside Brazilian borders.