Abstract: Persistent gender inequalities in internal political efficacy have traditionally been attributed to gender differences in resources. This article complements the resource model by focusing on how gendered political socialization occurs during citizenship education and how citizenship education might mitigate, reproduce, or intensify inequalities. Based on multilevel models on a 2016 survey dataset (3898 students across 150 schools) of Belgian senior high school students, we show that citizenship education increases internal political efficacy for both male and female students. However, we also find that citizenship education intensifies inequalities since male students gain more from it than female students, especially in schools with a conservative gender role culture. Our results indicate that the influence of citizenship education depends on the gendered school context in which it is offered. In this respect, citizenship education risks intensifying rather than mitigating gender inequalities.