Objective: Gaining understanding of the health-related quality of life (HRQL) of family caregivers of people with dementia with Turkish or Moroccan immigrant backgrounds and to examine whether an educational peer group intervention can improve HRQL. Methods: Understanding of HRQL and associated variables was obtained by multiple linear regression analyses. The effects of the intervention on HRQL were assessed in multilevel analyses using data collected before the start (baseline), directly after the intervention (one to two weeks after baseline) and three months after the start of the intervention. The intervention (two interactive group sessions) entailed providing information about dementia and care/support options. Results: At baseline (n = 319), HRQL was moderately and significantly associated with migration background, gender, self-perceived pressure from informal care and the formal and informal support received (p < .05). The intervention had a small effect on Heide, I. van der, Wezel, N. van, Blom, M., Spreeuwenberg, P., Devillé, W.L.J.M., Francke, A.L. Effects of an educational intervention on health-related quality of life among family caregivers of people with dementia with a Turkish or Moroccan immigrant background: Insights from a cluster randomised controlled trial. Patient Education and Counseling: 2020 Postprint version : 1.0