This Research in Brief looks at teen dating violence research from the perspective of peers in the context of which peer interactions can contribute to the risk for and protection against dating violence. Although the focus is primarily on findings from National Institute of Justice (NIJ) funded research, the authors also draw upon broader literature on adolescent development and romantic relationships to show ways that teens shape each other's experiences across the spectrum of entering into and leaving violent romantic relationships. Recognizing the large number of youth who experience dating violence, policymakers at the federal and state levels have worked to raise awareness of dating violence, prevent violence from occurring, and offer more protection and services to victims. In response to this increased focus on teen dating violence, since 2008 NIJ has provided close to $15 million in funding for basic, applied, and policy-level research on dating violence. These projects have led to increased knowledge about risk and protective factors and psychosocial health behaviors associated with teen dating violence, and to the development and evaluation of dating violence prevention programs targeting diverse samples of youth. Research has also examined adolescents' knowledge of and barriers to using protection orders against violent partners.