The purpose of this study was to determine the relationship between students' quality of attachment to their primary caregivers and the frequency with which they bully others and are the victims of bullying. One hundred and five students in Grades 4, 6, and 8 (46 girls, 59 boys; M = 10.5 years) completed paper and pencil surveys. Results indicated that students with lower quality attachment relationships are more likely to bully others and be the victims of bullying than their peers with higher quality attachment relationships. No significant grade or sex differences were found for the attachment, bullying, or victimization variables. Implications and directions for future research are discussed. (Contains 3 tables and 1 note.)