Background Intimate partner violence (IPV) is prevalent in high-as well as low-income contexts. It results in a substantial public health burden and significant negative socioeconomic and health outcomes throughout the life-course. However, limited knowledge exists about IPV during early adolescence. This period is critical during the transition to adulthood for at least two reasons: it is when the majority of adolescents in low-income countries first encounter dating, sexuality and partnerships, often with older adolescents or adults, and it is also the period when lifelong patterns of violence and norms about acceptable IPV are formed. The current study is one of the first to measure IPV prevalence among young adolescents in a low-income setting, examine the potential etiology, and investigate relationships with gender ideology, poverty, mental health and childhood adversity. Methods We surveyed 2,089 adolescents aged 10-16 in Malawi using standardized instruments. We estimated the prevalence of IPV, and use multivariate logistic regression to test potential correlates. Results More than a quarter (27%) of ever-partnered adolescents in Malawi report being victimized. A substantial proportion of both male and female adolescents (15%) report committing violence against their partner. Girls were more likely than boys to report being a victim of sexual IPV (24% versus 8%), and boys more likely to perpetrate such (9% versus 1%). Almost 10% of the sample had both committed and been a victim of IPV. Cumulative childhood adversity (e.g., physical abuse, witnessing domestic violence) was a consistent and strong correlate of IPV victimization (adjusted odds ratio (aOR) 1.30) and of perpetration (aOR 1.35). Depression and PTSD were likewise associated with IPV victimization in the overall sample.