The gender and politics literature offers diverse views on the causes of gendered practices and the best methodologies for studying them. This article advances efforts to take stock of and systematize this diversity by grounding the feminist institutionalist perspective in critical realism. The article posits that gendered institutions are real entities with independent powers, while also emphasizing the crucial role that human ideas play in upholding and contesting gendered practices. To faithfully capture gendered institutions and their relationship with human agency, the article promotes the use of the abductive-retroductive research design. This approach allows feminist institutionalist scholars to construct and test multiple competing theories about gendered institutions, drawing from various empirical manifestations of institutional power. These expressions range from observable actions to codified rules, socially shared norms, and other subtle discourses. By shedding light on the principles at the heart of realist-oriented feminist research, this work paves the way for a more standardized and transparent approach to feminist inquiries.