Violence against women and girls is increasingly recognized as a major global public health and development concern. However, evidence on what forms of intervention should be prioritised is severely lacking. A cluster randomized controlled trial (The Intervention with Microfinance for AIDS & Gender Equity - IMAGE Project) in rural South Africa combined a group-based microfinance intervention with a participatory gender and HIV training curriculum for loan participants and showed that, over a two-year period, levels of physical and/or sexual partner violence experienced by participants in the past year were reduced by 55%.