<p>The study aims to investigate how procrastination mediates the relationship between Facebook addiction and mental health among university students in Vietnam. Using data from 2476 university students in Vietnam collected through cross-sectional methods, we employed structural equation modeling (SEM) to analyze the relationships. We found that Facebook addiction is positively associated with both procrastination and psychological distress, while negatively associated with life satisfaction. Procrastination was identified as a partial mediator between Facebook addiction and psychological distress, and between Facebook addiction and life satisfaction among university students. These results highlight the relationship between Facebook addiction, procrastination, and mental health among Facebook users who are university students in Vietnam. At the same time, the research results provide insights into measures to improve mental health among Facebook users who are university students in Vietnam.</p>