This research adresses Social Assistance, Philanthropy from the discussion about legislation and reorganization. More specifically, we sought to deepen the debate about philanthropy in the Catholic context, correlating the theoretical field with professional experience, with the objective of understanding the reorganization of Social Welfare Entities, with a Catholic religious character, to the current regulatory frameworks of Social Assistance, based on the advisory experience of the Archdiocese of São Sebastião do Rio de Janeiro. Philanthropic institutions are protagonists in the development of care in Brazil, and after the promulgation of the Federal Constitution of 1988 (CF / 88), it was foreseen that the State has the main responsibility for providing Social Assistance. We plan this research based on the advisory experience carried out by the Social Service team of the Archdiocese of Rio de Janeiro, in order to better approximate the regulatory frameworks of SUAS - Sistema Único de Assistência Social. In order to guide the deepening of the thematic, the following objectives were pursued: to analyze the changes in the provision of services in Social Welfare Entities, assisted by the Social Work of the Archdiocese of São Sebastião do Rio de Janeiro, after the implementation of Law no. 12.101/2009; analyze how the social workers and managers qualify the reorganization of the Social Assistance Entities; to identify the specificities of Social Welfare Entities as Catholic religious institutions under the perspective of the social worker; identify the challenges experienced and strategies developed by the Social Service during the reordering process.