Introduction: Overweight and obesity among adults, especially young adults have been increasing for the past 20 years and is an emerging public health concern all over the world, including Malaysia. This study aims to explore the determinants of overweight and obesity among undergraduate students residing in Universiti Putra Malaysia. Methods: A cross-sectional study using random sampling was conducted in three residential colleges. Independent variables include socio-demographic factors, knowledge on physical activity and dietary intake, lifestyle (physical activity, dietary intake, sleep duration and quality and smoking status) and stress. Data was collected using a vali-dated and reliable self-administered questionnaire and anthropometric measurement (weight and height were mea-sured to determine body mass index). IBM Statistical Package for Social Science (SPSS) version 23 was used for data analysis. Multiple logistic regression was employed to find the determinants of overweight and obesity among the respondents. Significant level was set at less than 0.05. Results: A total of 494 respondents participated with 98.8% response rate. Overweight and obesity prevalence among the respondents was 38.1% with 22.9% and 15.9% of the respondents were overweight and obese respectively. The significant associated factors were age group of 24 years and above (AOR=2.671, p=0.04), male (AOR=1.818, p=0.04), Malay ethnicity (AOR=5.34, p=0.008) and Indian ethnicity (AOR=7.155, p = 0.018). Conclusion: Overweight and obesity prevalence among undergraduate students were more than one third. Programmes and policies should be directed to these high-risk groups as identified in this study.