The Oxford Handbook of Positive Psychology, 3rd Edition, edited by C. R. Snyder, Shane J. Lopez, Lisa M. Edwards, and Susana C. Marques provides an extensive overview of the theories, research, and applications that define the field of positive psychology. The handbook examines topics such as well-being, happiness, hope, optimism, resilience, strengths, emotions, motivation, relationships, self-regulation, meaning, spirituality, physical health, coping, and positive development across the lifespan. Contributions from leading researchers also explore biological, cognitive, interpersonal, cultural, and institutional perspectives on human flourishing, along with applications in education, work, health, and everyday life. Designed for advanced psychology students, researchers, clinicians, and professionals, the 3rd Edition serves as a comprehensive reference for understanding the scientific study of positive human functioning and the factors that help individuals and communities thrive.