This study examined the effects of change in teacher goal emphases on students' efficacy beliefs in mathematics across the transition to middle school. The sample (N = 929) included primarily White (65%) and Black (27%) students, and approximately one third received free or reduced-fee lunch. Analyses grouped children by cross-classification of teachers (N = 53 elementary and N = 34 middle school teachers). On average, students' efficacy beliefs remained stable and relatively high across the transition. Compared with their elementary school teacher, children reported declines in both perceived teacher mastery and performance goal emphases in middle school. A cross-classified hierarchical linear model was used to estimate the effects of perceived teacher and parent goal emphases during 6th and 7th grades on changes in students' efficacy beliefs. An increase in self-efficacy beliefs from elementary to middle school was predicted by an increase in group-level perceptions of teachers' mastery goal emphasis, even after controlling for parents' goal emphases. These findings underscore the important role that both teachers' and parents' goal emphases play as children develop a sense of efficacy in mathematics. (Contains 4 tables and 3 figures.)