Background: Social stigma is the most common and challenging burden of care on the family of people with Borderline Personality Disorder (BPD) In Iran, despite the cultural and social influences, this issue has been less studied. Therefore, present study was conducted to determine the lived experiences of caregivers of patients with BPD of social stigma. Materials and Methods: This qualitative study was performed at Ibn Sina hospital in Mashhad, Iran from 2017 to 2019. Participants were selected by purposive and snowball sampling method.