The purpose of this research was to describe bullying on the playground The subjects were children observed either bullying or being victimized on the playground. Bullying episodes were identified with 90% inter-rater agreement. Bullying occurred regularly on the playground, approximately once every seven minutes and was of short duration, 38 seconds. The majority of bullying episodes (68%) occurred within 120 feet of the school building. Adults were found to have intervened in 4% of the episodes, while peers intervened in 11% of the episodes. However, adults were more likely to intervene than peers if they were present. Peers were involved in some capacity in 85% of the episodes. Boys bullied more than girls and were more likely to bully victims of the same-sex and repeatedly target the same victim. There were no gender differences in the type of bullying and aggression. Children in the primary and junior grades were equally likely to be involved in bullying and tended to bully students from the same grade level. The results are discussed from an individual difference, socialinteractional, and ecological perspective.