Introduction: Dementia is considered as a serious threat for over 65years old population, because of its high prevalence rates. Dementia with a complex and multifaceted nature has negative effects on patients, family members, and their caregivers' psychological health and socioeconomic status. The current qualitative study is designed to investigate the stigma phenomenon to dementia in Iranian population. Methods: This qualitative research was conducted by the descriptive phenomenological method.