Health psychology and World Mental Health Day are closely linked through their shared focus on promoting psychological well-being and understanding the relationship between mental and physical health. Health psychology provides the scientific framework for examining how factors such as stress, behaviour, and social support influence both mental and physical health outcomes. Similarly, World Mental Health Day serves as a global platform to raise awareness, reduce stigma, and advocate for improved access to mental health care. Together, they highlight the importance of prevention, early intervention, and education in fostering resilience and healthier lifestyles. By translating health psychology’s research and insights into public awareness campaigns, World Mental Health Day bridges the gap between scientific knowledge and real-world impact, ensuring that mental health is recognized as an essential component of overall health.