This thesis is a study about the role of women's mobilization in matters of identity, ethnicity and national belonging. It focuses on women's associations called fujinkai established by Japanese immigrants in Brazil throughout the twentieth century. This analysis is based on theoretical and epistemological contributions from gender studies, historical sociology of migration and postcolonial studies. The research data suggests that Japanese-Brazilian female associations were articulated to address issues and anxieties regarding racial mixture, cultural loss and to aid the production of positive representations about Japan and the Japanese in the global landscape. After Japan was defeated in World War II, these organizations resurfaced with a new purpose, promoting voluntary works of social, cultural and philanthropic interest, contributing to the create new Japanese identities distanced from imperial-nationalist references and aligned with a project of socioeconomic ascension for Japanese-Brazilians in Brazil. Far from presenting definitive conclusions, this work seeks to establish analytical possibilities by problematizing the political meanings of women's domestic roles and mobilization and the interplay between gender and other relations of power such as class, race, ethnicity and nationality.