Peer-assessed problem behavior was examined in relation to peer group membership and social network centrality (social prominence) in 59 fourth-, fifth-, and sixth-grade classes. Differences among students with and without disabilities were explored. Peer assessments for Starts Fights, Gets in Trouble, and Disruptive were used to identify students with high levels of problem behavior. Students with high peer-assessed problem behavior tended to associate with peers who shared their behavioral features, and they were as socially prominent as students with low problem behavior. Most students with high peer-assessed problem behavior were students without disabilities, but students with disabilities were overrepresented at the highest levels of problem behavior. Within prominent problem behavior peer groups, students without disabilities tended to have higher prominence than students with disabilities. Implications for school services are discussed.