Background: Depression is a major psychiatric disorder worldwide. It is a leading cause of individual disability and family burden worldwide. The aim of the study: the aim of this study was to investigate the effect of family intervention on caregivers' burden, depression, anxiety and stress among relatives of depressed patients. Subjects and method: A quasi-experimental design was conducted at the inpatient and outpatient Psychiatric Department Mansoura University Hospital, Egypt. Ninety five families participated in this study (n = 95). Pre-tests and post-tests (n = 95), and test 3 months after intervention were conducted on eighty six (n = 86). The caregivers were divided into ten groups, which ranged from 8 to 10 caregivers in each group; each group attended 12 sessions. A structured interview questionnaire for personal data for patients and their caregiver, Caregiver Burden scale, quality of life scale (QOL) and Depression, Anxiety and Stress Scale-21 items (DASS-21) were used to collect data. Results: The findings of the study indicate that caregivers' burden, depression, anxiety and Stress level significantly reduced, and quality of life significantly improved after implementation of family intervention. There is a negative correlation between QOL and Caregivers' burden, and their feeling of depression, anxiety and stress, while there was a positive correlation between caregivers' burden and their feeling of depression, anxiety and stress. Conclusions: Based on the current results, it can be concluded that caregivers' burden, |depression, anxiety and stress are highly prevalent among caregivers of patients with depression and significantly improved after implementation of family intervention one month after, moreover it slightly decreased three months after intervention. This conclusion leads to accept the hypothesis of the study that family interventions improve the caregivers' burden, QOL, and feelings of depression, anxiety and stress. Further research is needed to follow the intervention 6 and 12 months after family intervention.