Mainstream theory and research in the field of social movements and political sociology has, by and large, ignored the influence of gender on social protest. A growing body of feminist research demonstrates that gender is an explanatory factor in the emergence, nature, and outcomes of all social movements, even those that do not evoke the language of gender conflict or explicitly embrace gender change. This article draws from a case study of the postpartum depression self-help movement to outline the relationship (...) between gender and social movements. Linking theories of gender to mainstream theories on social movements allows us to recognize gender as a key explanatory factor in social movements and, in turn, to identify the role that social movements play in the social construction of gender. (shrink)