Abstract: The aim of this paper is to describe adolescent reports of gender based violence (GBV) based on a cross-sectional survey conducted with grade 8 boys and girls in high schools. . Self-completed paper based surveys were implemented with 1756 adolescents in 24 Johannesburg high schools in 2012 and with 2202 adolescents based at 30 Johannesburg high schools in 2013. Consent was required from both parents and learner in order for learners to participate. The results show high levels of GBV among adolescents, though fewer adolescents reported in 2013 than 2012. Boys were significantly more likely than girls to report experiencing all types of GBV, except for three physical GBV indicators in 2013. A specific indicator asked about rape and threats of rape. Whilst these figures were lower than asking about specific incidents of sexual violence, rates of rape were still between 8-11 %. The majority of perpetrators of rape and threats of rape were male. Adolescents were more likely to report experiences to family and friends, rather than authorities. Although a quarter of perpetrators were strangers, more were known to the victim. Findings suggest that adolescents are experiencing high levels of GBV from those known to them. Hence, there is a need for more accessible options for reporting and supporting adolescents to deal with these experiences, such as social workers in schools. Intervention and prevention strategies to deal with GBV are urgently required in the school context with both boys and girls as part of the curriculum.