Fredrickson's (1998, 2001) broaden and build theory postulates that the experience of frequent positive emotions serves to broaden humans' thoughts and behaviors, resulting in accrual of resources, including coping resources, which catalyze upward spirals toward future well-being. Initial research supports the tenets of broaden and build; however, few if any, studies have examined this theory with children or adolescents, particularly in the context of school experiences. This study explored the role of positive emotions during school, coping, and student engagement among a sample of 293 students in grades 7 to 10. As expected, frequent positive emotions during school were associated with higher levels of student engagement and negative emotions with lower levels of engagement. Positive emotions, but not negative emotions, were associated with adaptive coping, which was then associated with student engagement. The association between positive emotions and engagement was partially mediated by adaptive coping. Results support the broaden and build theory and the role of positive emotions in students' engagement at school and with learning. Implications and future directions for research are discussed. (Contains 4 tables.)