Abstract The first study in Great Britain to provide a detailed picture of the incidence and impact of teenage partner violence, funded by the NSPCC and the Big Lottery Fund. Involved a survey of 1353 young people, aged between 13-17 from England, Scotland and Wales, and in-depth interviews with 91 young people. Findings include: violence in intimate relationships is a significant child welfare problem; girls reported a greater incidence of experiencing violence; young participants were as likely as older adolescents to experience violence. Factors for experiencing and instigating violence included child maltreatment, domestic violence and aggressive peer networks. Girls with an older partner had the highest levels of victimisation. Young people either told a friend or no one about the violence.