Introduction: Medical school expected to be a time of personal development, achievement, and well-being. However, research shows that there are many negative effects on students’ mental health due to the current educational process. Objective: This research aimed to determine the prevalence and risk factors of depression, anxiety, and stress among medical students of a private medical university in Malaysia. Method: Cross sectional study was conducted using self-administered questionnaires including socio-demographic factors, DASS-21 and MSSQ-40 questionnaires. Result: Prevalence of stress, anxiety, and depression were 46.9%, 76.2% and 60.2% respectively. Multiple logistic regression analysis showed that academic related stressors were only associated with stress [adjusted OR 1.78, 95% CI (1.23, 2.58), p=0.002]. Group activities related stressors were significantly associated with stress [adjusted OR=1.45, 95%CI (1.20, 1.75), p