This study explores how demographic factors namely gender, age, ethnicity, religion, level of education, and marital status affect psychological well-being (PWB) among NGO volunteers. It also investigates the role of Emotional Intelligence (EQ) on Psychological Well-being (PWB). Data were collected from 377 NGO volunteers in Sabah, consisting of 99 male volunteers (26.3%) and 278 female volunteers (73.7%), and analyzed using SPSS version 29. Statistical methods used include independent sample t-tests, ANOVA, and simple linear regression. Results indicate that gender, level of education, ethnicity,religion, and marital status did not significantly influence PWB. In contrast, only the age group has a significant impact on PWB. Similarly, EQ has a meaningful impact on PWB. These findings highlight the importance of emotional intelligence in improving the volunteers’ psychological well-being. Future studies are encouraged to examine other variables that can help in enhancing the mental health of the volunteers.