Introduction: Obesity considered as one of the common causes of multiple problems and increasing mortality worldwide. It is also considered as a main factor related to psychological problems, mainly depression and anxiety. Aim: In this study, we aimed to assess the prevalence of psychological problems among post bariatric surgery patients in Saudi Arabia. Methods: A descriptive cross-sectional study was conducted in King Abdulaziz Medical City in Riyadh, Jeddah and Dammam. A convenience sampling technique was used. Data was collected using a well-developed questionnaire and distributed in bariatric surgery clinics and filled by post-bariatric surgery patients, Results: This study showed that 47.4% of the respondents were depressed, or hopeless several days, while 8.4% feeling depressed, or hopeless nearly every day, 40.6% of the respondents suffer from trouble falling or staying asleep or sleeping too much for several days and 12% of them suffer from trouble at sleeping nearly every day, 35.6% of the respondents of the study feeling tired and little energy for several days, 16.2% feeling that nearly every day. It also found that the prevalence of psychological problems, mainly depression among post bariatric surgery patients was 23%. Conclusion: This study showed significant increase in the occurrence of post bariatric surgery psychological problems such as anxiety and depression among respondents, so we strongly recommend pre- and postoperative psychiatric assessment for all Bariatric surgery patients in clinics.