This chapter explores the key criteria used to evaluate the quality of hospitals and clinics worldwide, with a particular focus on internationally recognized performance indicators and global ranking systems. It begins by examining the most common Key Performance Indicators (KPIs) employed to assess hospital effectiveness, including clinical outcomes, patient safety metrics, operational efficiency, innovation, patient satisfaction, and academic productivity. The chapter also identifies leading institutions responsible for monitoring and benchmarking healthcare quality, such as the World Health Organization (WHO), Joint Commission International (JCI), and U.S. News & World Report. Drawing from comparative global rankings, the text investigates the structural, cultural, and strategic factors that distinguish best-in-class hospitals from their peers. A detailed analysis of five hospitals consistently ranked among the top in the world over the last decade reveals shared characteristics such as strong leadership, data-driven quality management, integrated academic and clinical missions, and patient-centered organizational cultures. The chapter concludes by emphasizing the importance of mission alignment, transparent performance monitoring, and continuous improvement as drivers of healthcare excellence. It offers both conceptual clarity and practical insights, helping readers understand what makes the world’s best hospitals successful and how those lessons can be applied to other healthcare settings.