We examined predictors of rape myth acceptance (RMA) and bystander attitudes among college women (n = 137). Participants completed self-report measures of RMA, bystander attitudes, sexist beliefs, gender-conforming attitudes, sexuality attitudes, sexual knowledge, and just world beliefs. Stepwise multiple regression analyses indicated that RMA was predicted by hostile sexism, sexual attitudes, and post-assault report bystander attitudes, and bystander attitudes. Bystander attitudes were predicted by the "It wasn't really rape" rape myth subscale, masculine norm conformity, and hostile sexism.