Intersectionality theory/paradigm was introduced into feminist theory and policy literature by Crenshaw in 1989. Intersectionality theory/paradigm, which enables the study of experiences of marginalization at the intersection of social categories, especially race and gender, and the systems of oppression on which these categories are based, has become powerful and widespread enough to shape feminist and gender studies since the early 2000s. In this study, firstly, the theoretical and political debates on intersectionality theory/paradigm are analyzed in general terms. Secondly, the difficulties in Psychology and Social Psychology's encounter with intersectionality theory/paradigm are discussed. Finally, it focuses on how the theory/paradigm of intersectionality in feminist psychology challenges quantitative research methods and reviews the theoretical/epistemological and methodological literature on this topic by feminist psychologists.