Zoonotic diseases are increasing in frequency and impact, driven by population growth, agricultural intensification, environmental change, globalization, climate pressures, and antimicrobial resistance. Because most emerging infectious diseases originate from animals, the health of people, animals, and ecosystems is fundamentally interconnected. Through selected examples—including foodborne, waterborne, vector-borne, and influenza-related diseases—this publication highlights the complex drivers of zoonotic emergence and the limitations of siloed responses. It emphasizes the need for a One Health approach that integrates human, animal, and environmental health through strengthened surveillance, cross-sector collaboration, infrastructure investment, and prevention-focused strategies. Adopting One Health is essential to reducing the risk of future outbreaks and building a more resilient and secure global health system.