Background: Physical activity and lifestyle are influenced by a number of things. The lockdown imposed by the coronavirus disease (COVID19) has limited student activity and altered their daily routine. Accordingly, obesity is a huge public health issue that has negative consequences for both physical and mental health. Aim: to find out association between stress and obesity among female student during COVID 19 pandemic at health colleges in Qassim university, kingdom Saudi Arabia. Subject and methods: A cross-sectional study was carried out from 15 October to December 2020. A total of 425 female students at health colleges (Medical, Nursing, Pharmacy, Medical laboratory) at Qassim university, KSA responded to the self-administered online survey. Two instruments, namely factors upshifting body weight and stress and the anthropometric, measurements, were used. Statistical tools such as frequency, percentage, were used for the descriptive analysis. Results: Most of student's suffered stresses with the major sources are academic, financial or economic, relationship, and future /career growth source. Also, there are a statistically significant relation was found student's sociodemographic data and their body mass index mainly in items related to age and marital status . Furthermore, there are statistically significant relations were found student's body mass index and all items related to their dietary habits during stress (p <0.000). Conclusion & recommendations: Students need for receive regular; periodic in-service dietary program contains methods of coping with stresses which indirectly added stressor on student's psychological status and indirectly affect their dietary habits and behavior. There is an evident necessitate for designed curriculum in the colleges regarding benefits of physical activity and eating patterns in health colleges. Further studies are needed to study the coping strategies that influence university students' eating behavior with the study stressors.