The effects of service-learning on social responsibility and academic success were investigated among a large, racially and socioeconomically diverse sample of students in Grades 6 through 8 in three middle schools. Over the school year, service-learning students maintained their concern for others’ social welfare, whereas control students declined on those concerns. Service-learning students, especially girls, also declined significantly less than did controls in their frequency of talking with parents about school. Compared with other students, students with substantial hours of service-learning, a lot of reflection, and a high degree of motivation attributed to service-learning, significantly increased their belief in the efficacy of their helping behaviors, maintained their pursuit of better grades and their perception that school provided personal development opportunities, and decreased less in their commitment to classwork. The results indicate that service-learning can positively affect students’ social responsibility and academic success.