This study investigated predictors of adolescent girls’ experiences with sexism and feminism. Girls (N = 600; M = 15.1 years, range = 12–18), of varied socioeconomic and ethnic backgrounds, completed surveys of personal experiences with sexual harassment, academic sexism (regarding science, math, and computer technology), and athletics. Most girls reported sexual harassment (90%), academic sexism (52%), and athletic sexism (76%) at least once, with likelihood increasing with age. Socialization influences and individual factors, however, influenced likelihood of all three forms of sexism. Specifically, learning about feminism and gender-conformity pressures were linked to higher perceptions of sexism. Furthermore, girls’ social gender identity (i.e., perceived gender typicality and gender-role contentedness) and gender-egalitarian attitudes were related to perceived sexism.