The present studies identified the underlying attitudinal factor structure of the concept of feminism, providing a measure of what it means to be a feminist, and explored the predictive validity of these components for self-identifying as a feminist and endorsing traditional gender roles. Data were gathered from student populations (Study 1 n = 199, Study 2 n = 230) and community samples obtained through MTurk (Study 1 n = 204, Study 2 n = 260). Study 1 identified, and Study 2 replicated, four components underlying the concept of feminism (positive personal characteristics, negative stereotypes of feminists, equality/fairness ideals, and stereotypes of womanhood). Further, cluster analysis identified two groups of participants across both studies: (1) one that associates feminism with equality/fairness ideals while being relatively neutral towards the other factors, and (2) one that accentuates the positive aspects of feminism (equality/fairness ideals and positive personal characteristics) while downplaying the negative aspects of feminism (negative stereotypes of feminists). Cluster membership was related to self-identification as a feminist, with the group that accentuates the positive while downplaying the negative being more likely to self-identify as feminist. These studies provide a conceptual understanding of what it means to be a feminist, helping elucidate why people might be hesitant to self-identify as feminist.