Objective: This study aims to analyse the beliefs of “professionals” about stigma and self-stigma in the group of psychiatric patients. Material: The study was conducted on 204 “professionals” involved in the treatment of people with mental disorders. The respondents voluntarily completed the questionnaire. Method: A multi-part survey. The questions were grouped into topical blocks on different aspects of stigma and self-stigma. Results: A significant percentage of the respondents encountered the concepts of stigma (100% – doctors, 92.6% – psychologists, therapists, 98.1% – others) and self-stigma (65.9% – doctors, 71.3% – psychologists, therapists, 80.8% – others) in their practice. Most of them try to take stigma and self-stigma into account when treating their patients and believe that these aspects have a strong impact on recovery. They are not aware of any interventions that could support their practice. Conclusions: The results indicate the need to develop interventions to prevent stigma and self-stigma among people with mental disorders.