Background: South African adolescents experience disproportionally high rates of violence, with lifelong health, social and economic impacts. Few papers present risk factors associated with experiences of adolescent violence. Methods: A baseline cross-sectional survey was done (April 2017 – Sept 2018) with 3432 grade 8 learners in the Girls Achieve Power (GAP Year) trial from 26 high schools in three townships (Soweto and Tembisa, Gauteng and Khayelitsha, Western Cape). Collected data on lifetime experiences of different types of violence, perpetrators, and place of violence. Descriptive statistics and logistic regression were used to enumerate experiences of, and factors associated with violence. Results: A total of 2383 respondents are included. Most (63.1%) were girls, 81.5% aged 12-14. In total 25.9% had ever experienced violence, higher among boys (p=<0.001). Physical violence was most common (35.7%), then psychological (21.8%), sexual (13.1%), neglect (10.6%), cyberbullying (7.6%), corporal punishment (6.5%) and economic abuse (4.8%). Boys experienced more physical violence (36.0%); girls experienced more psychological violence (22.2%). Gauteng had double the reports of sexual violence (18.4% vs 7.6%, p<0.001). Violence happened most at school (27.4%), followed by the park (19.8%) or their friends’ home (12.9%). Multivariate analysis showed that boys (aOR 1.68; 95% CV 1.32-2.14; p<0.001), those aged 15-17 years (aOR 1.41; 95% CV 1.04-1.89; p=0.025), those who ever used substances (aOR 1.90; 95% CI 1.9-2.28; p<0.001), and those who sometimes feel worthless (aOR 1.33; 95% CI 1.09-1.63, p=0.005) were at higher odds of ever experiencing violence. Those who had ever had sex were more likely to have ever experienced violence (aOR 1.42; 95% CI 1.10-1.83; p=0.008). Conclusion: Urgently need wider adoption, scaling, and sustaining of evidence-based primary violence prevention and structural interventions are required to reduce the high burden of adolescent violence. Stakeholders across the ecological model are needed to tackle harmful cultural norms that perpetuate violence.