This thesis examines the evolution of the protection of women against domestic violence in Brazil, influenced by the performance of the Inter-American Human Rights system in protecting the rights of women in the region. This examination is done by looking at the Case of Maria da Penha before the Inter- American Human Rights Commission and its repercussions in Brazil. Historically, domestic violence against women in Brazil was socially perceived as a private matter. This percection has permeated the social relations and the conduct of the State towards women – leading to little or none State intervention in case of violations of women rights within a familiar or domestic environment. In the last years, the Inter-American Human Rights system has been invested in pressuring State members of the OAS towards combating domestic violence and providing women with the adequate support. This thesis seeks to answer whether this pressure has resulted in a satisfatory response from the Brazilian State and if such reaction has provided effective results in improving the protection of women against domestic violence in the country. In addition, the thesis highlights the transnational dimension of the IACHR and it's role in ensuring the protection of women.