The United Nations 2030 Sustainable Development Plan is one of the most ambitious and impactful global agreements in recent years. It is based on a "global call to action to end poverty, protect the planet, and improve the lives and prospects of everyone, everywhere by 2030." Specifically, the third goal of the Sustainable Development Goals (SDGs) focuses on ensuring good health and well-being, which translates to promoting a healthy lifestyle and well-being for people of all ages. Consequently, the current study aimed to determine the impact of perceived organizational support on the well-being of nursing staff, particularly in the aftermath of the COVID-19 pandemic, which has significantly affected healthcare workers, especially those in government hospitals. The study also examined the moderating role of emotional contagion in this relationship. Using a survey method, primary data was collected from a sample of 312 respondents across 12 government hospitals in the Sharqia Governorate. By employing hierarchical multiple linear regression (HMLR), the study concluded that there is a statistically significant relationship between perceived organizational support and the well-being of nursing staff in government hospitals in the Sharqia Governorate. Additionally, the study found that emotional contagion has a statistically significant moderating effect on the relationship between perceived organizational support and nursing staff well-being. As emotional contagion increases, the well-being of nursing staff decreases, and vice versa. Finally, the study discussed the results, theoretical implications, practical applications, limitations, and future research directions.