BackgroundBereavement can have significant impacts on physical and mental health, and a minority of people experience complicated and prolonged grief responses. Primary care is ideally situated to offer bereavement care, yet UK provision remains variable and practitioners feel uncertain how best to support bereaved patients.AimTo identify what works, how, and for whom, in the management of complicated grief in primary care.Design & settingA review of evidence on the management of complicated grief and bereavement in UK primary care settings.MethodA realist approach was taken which aims to provide causal explanations through the generation and articulation of contexts, mechanisms, and outcomes.ResultsForty-two articles were included. Evidence on the primary care management of complicated or prolonged grief was limited. GPs and nurses view bereavement support as part of their role, yet experience uncertainty over the appropriate extent of their involvement. Patients and clinicians often have differing views on the role of primary care in bereavement. Training in bereavement, local systems for reporting deaths, practitioner time and resources can assist or hinder bereavement care provision. Practitioners find bereavement care can be emotionally challenging. Understanding patients’ needs can encourage a proactive response and help identify appropriate support.ConclusionBereavement care in primary care remains variable and practitioners feel unprepared to provide appropriate bereavement care. Patients at higher risk of complicated or prolonged grief may fail to receive the support they need from primary care. Further research is required to address the potential unmet needs of bereaved patients.