Introduction: Despite evidence that that the coronavirus disease 2019 (COVID-19) in general poses unprecedented risks, it is unclear to what extent these consequences have affected the mental health of the general population. This study aims to evaluate the psychological impact of the COVID-19 pandemic on the general population in Oman and to associate the physical health status and psychological impact. Methods: A cross-sectional online anonymous survey in which 831 adults from Oman’s general population were randomly sampled as per the inclusion criteria. The medical research and ethics commission approved the project. Data were collected after obtaining informed consent from the study participants. The criteria of the American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders was used to measure the psychological impact. Results: Among 831 respondents in this study, only 4.2 % and 14.9 % of total participants reported depressive and anxiety symptoms, respectively. There is a statistically significant difference in psychological scores between males and females at the p < .05 level: F (1, 829) = 16.03, p < .001. As a result of this discovery, it appears that women are mentally affected by the pandemic. Conclusion: The COVID-19 epidemic has had a severe impact on the general population’s psychological health in Oman. This survey found that the global health crisis has a psychological impact on most of the adult population, regardless of their age. As a result, early detection, urgent medical intervention, and counseling are required.