Past research shows that higher well-being is reported by adolescents who live in individualistic rather than collectivistic nations. Such cross-national differences may be due to the amount of autonomy support adolescents receive from authority figures. To examine this hypothesis, in the current study, 322 adolescents from Denmark, South Korea, and the United States completed self-report surveys that assessed adolescents' school and life satisfaction and their experience of autonomy support from parents and teachers. Results showed that Danish adolescents reported highest school satisfaction, life satisfaction, and perceived autonomy support, followed by American and Korean adolescents, respectively. Furthermore, cross-national differences in school and life satisfaction were partially mediated by adolescents' perceptions of autonomy support from authority figures. These findings support self-determination theory (Deci & Ryan, 1985) and the ecological model of child development (Bronfenbrenner, 1986).