Background and Aim: Incorrect beliefs and negative thinking of society and in the family affect psychiatric patients over the process of treatment, care and recovery. The aim of this study was to investigate the effect of group counseling on the attitude of family caregivers in patients with mental disorders. Materials and Methods: This quasi experimental study was conducted in psychiatric wards of Farshchian Hospital in Hamadan in Iran in 2018. 49 family caregivers were randomly selected to the study.