Self-categorization theory suggests thatwhen asocialidentity is salient,grouporiented behavior willensue. Thus, women should be likely to actoutagainstgender discrimination when their social identity as women is salient. However,self-categorization theory has typically defined asocial identity along stereotypes, which may serveinstead to maintain the status quo. Two studiestherefore examined the effects of two different social identities ontaking action against discrimination. Participants werefemale students (Anglo American (93%), African American(2%), Native American (2%), Hispanic (1%), Asian American (1%)and Other (1%)). Study 1 examineda structural model and Study 2 examined the causalrelationships, both hypothesizing that a social identitybased on stereotypes would be associated with less collective action than a social identity basedon social experiences. The hypothesis was supported, andimplications for expanding definitions of socialidentities were discussed.