The USAID Transform Primary Health Care Project supports the Ethiopian government in its efforts to strengthen health systems and prevent maternal and child deaths. The project’s gender analysis in 2018 identified male engagement as a crucial driver of improved reproductive, maternal, and child health outcomes. After a comprehensive literature review, the project decided to adapt a male engagement curriculum from Rwanda, Promundo’s Bandebereho, designed to bolster male support for family planning and antenatal care, which was evaluated through a randomized controlled trial in 2015. In this poster presentation, we share details of a participatory formative research and collaborative adaptation process program carried out by the Transform project in 2019-20 to successfully adapt this male engagement intervention to the cultural context of the two diverse regions in Ethiopia where it will be implemented. The poster sheds light upon the extremely important, but often understudied application of evaluation techniques for adapting evidence-based interventions across different countries and contexts.