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Mental health specialists have an essential role in evaluating bariatric surgery patients. Because arguments about how to measure the success of the surgical operations show that weight loss is no longer the sole criteria and the psychiatric, psycho-social and patient’s well-being are important also criteria for defining the success of the surgical operation. Bariatric surgery is not a cosmetic procedure. The selection a candidate for a bariatric surgery must be done with qualification. However, there is still no clear consensus regarding what constitutes selection criterion. Whether presence of psychopathology is contraindication to bariatric surgery is also a matter of dispute. Furthermore, whether psychological health specialists should be present in the selection candidates for bariatric surgery is not defined in the legislation. Just as there is not standard in psychiatric evaluations before surgery, there is not consensus about which psychological interventions will be most suitable and inşuential towards a positive outcome for the surgery. Along with this, pre-operational evaluation often encompasses behavioral, cognitive, emotional and developmental fields. Furthermore, the current stresses in the life of the patient, the motivation and expectations for the surgery should be evaluated. Comorbid psychiatric disorders, weight history, previous weight-loss attempts, social inşuences, and other environmental factors that might inşuence the operational outcomes should be investigated. The designation and finding remedies for these problematic fields of pre-operational problematic psychosocial factors and treatment of psychiatric disorders increase the benefit the patient will obtain from the surgery. Also, psychiatric evaluation is important since it will lead to a consciousness of the surgeon about this matter, to better understand to patient, and to be able to manage the treatment process. The results of the researches about the prevalence of psychopathology among patients who look for bariatric surgery clearly show that the proportions of psychopathology in this group are higher. Mood disorders, anxiety disorders, eating disorders and personality disorders are among the most commonly observed psycho-pathologic conditions. Although which psychopathologic states induce contraindication is being disputed, it is expressed that conditions such as dementia, mental retardation, drug addiction, severe obsessive-compulsive disorder, which is resistant to treatments, and borderline personality disorder are cases that should be evaluated more cautiously. The evaluation of bariatric surgery shouldn’t be limited to the pre-operational period and patients should also be follow-up. Because the undertaken research shows that the presence of a psycho-pathology effect both the results related to weight lost and also the post surgical well-being and functioning. Besides the bariatric surgery itself may inşuence psychopathologies in a negative or positive way. When psychiatric problematic fields are designated, the interventions may be one or more of the below Methods: Psychopharmacological treatments, psycho-education, psychotherapy to handle potential post-operational obstacles, dietary counseling, post-surgical close monitoring and encouraging involvement in an obesity surgery support group. When all these are taken into consideration, the evaluation and follow up of bariatric surgery patients should be done with a multi-disciplinary team that also includes mental health professionals.