The field of nuclear technology has been predominantly dominated by men, resulting in the omission or exclusion of women s contributions and their full participation in related activities. Only after the Cold War (1947–1991) did gender gain relevance as a category of analysis in international relations, which led to considerations about the inclusion and participation of women in international politics. In this context, the United Nations gender mainstreaming has become a globally recognized strategy for promoting gender equality. This dissertation critically discusses the elaboration and implementation of these strategies within the scope of the International Atomic Energy Agency (IAEA) between 2009 and 2023. It questions how the IAEA implements gender mainstreaming as a political-institutional transformation strategy in the nuclear sector. Faced with this question, we will start with the following argument: it is possible to verify that the IAEA has gradually implemented gender mainstreaming policies, especially regarding investment in capacity building, whether through measures aimed at training and qualifying female employees or investment in new generations of women through educational programs. To answer these questions, IAEA reports between 1958 and 2021were initially analyzed. The analysis is also based on academic research, interactions, and online conversations with employees from different hierarchical levels of the organization. The combination of such analyses allows us to conclude that the IAEA guided the institutional policy for education with the promotion of master s scholarships for women as a means of accessing gender equality in the long term.