BackgroundVery many social care clients have dementia, but few social care workers receive dementia-specific training.ObjectiveTo systematically review dementia training interventions for social care, review past policies and hold stakeholder workshops considering how future policy can support quality dementia training in social care.MethodsWe searched electronic databases, November 2015 to February 2024, including studies describing dementia training and support interventions for social care workers, assessing risk of bias with the Mixed Methods Appraisal Tool. We reviewed English policies January 2015 to April 2024 to identify social and policy contexts relevant to dementia training. We consulted home care and care home stakeholders regarding how findings could inform future policy.ResultsWe included 56 studies (50 in care homes, 6 in home care). There was good quality evidence that dementia training interventions in care homes that engaged staff “champions” to integrate practice-based learning reduced agitation, neuropsychiatric symptoms and antipsychotic prescribing and improved life quality of residents with dementia. One study found this approach was cost-effective. In home care, evidence was limited; group training was valued, and improved staff sense of dementia care competence in one study. We identified 27 policies and related documents; and consulted 18 stakeholders. Stakeholders supported mandatory dementia training but considered implementation very challenging in current economic contexts.ConclusionsWe found strong evidence for dementia training in care homes, but a relative lack of research in home care. Policy options identified to implement evidence require investment, which could deliver substantial savings across health and social care.