Recent discussions of boundary theory, particularly in the field of ethnic relations, emphasize varying degrees of porousness of social boundaries and the importance of considering the effects of the intersections of multiple boundaries, most notably those of gender, ethnicity/race, and class. It is also increasingly acknowledged that within-group characteristics, including identities, of subordinate as well as of dominant groups may change, without their becoming less authentic distinctive collectivities. This article examines the changing identities of a specific collectivity-French-speaking Canadian women living in Ontario-who, during the past century, have been either marginalized by, or excluded from, several larger collectivities for various reasons-religion, race/ethnicity, language, nationalism, region, and gender-related to boundary definitions of their multiple, intersecting identities. It explores the emergence of these various marginalities and the ability of these feminists to construct institutions and agendas on their own terms.