Good mental health is a cornerstone of societal resilience, yet countries in the BSR report alarmingly high rates of mental ill-health. There is an urgent need for effective mental health promotion, prevention, and treatment strategies to address this growing burden, driven by successive crises and expected to persist. The health sector alone cannot meet the demand. Overburdened primary care systems are struggling, creating inefficiencies that worsen the challenges. Addressing this issue requires a cross-sectoral approach to improving mental well-being, ensuring that BSR societies can recover from and adapt to crises. Sectors beyond health play a vital role in promoting mental health. Interreg projects highlight the potential of leveraging settings such as schools, workplaces, and cultural environments to improve outcomes. For instance, cultural interventions provide effective non-medical solutions for individuals with mild to moderate mental health conditions. However, these approaches require political recognition and systematic adoption. Decision-makers need robust information and evidence to implement cross-sectoral mental health initiatives. This project will create a platform to consolidate outcomes of various projects into actionable policy recommendations for national and regional decision-makers. By driving broader adoption of these solutions, the initiative will expand access to effective interventions, improving mental health and resilience across the BSR.