AIMS: Household food insecurity (FI) is a serious public health concern and disproportionately affects people living with chronic health conditions, undermining diabetes self-management. Little is known about healthcare professionals' (HCPs) experiences of supporting people affected by diabetes and FI, and no national guidelines incorporate consideration of FI within UK diabetes care. A qualitative study of NHS HCPs' consideration of FI within diabetes care, and the extent to which it informs their clinical practice, was undertaken. METHODS: Fifteen HCPs providing self-management support to people with Type 1 or Type 2 diabetes in a Scottish Health Board took part in semi-structured interviews. Data were analysed using a thematic framework approach informed by the Capability, Opportunity, Motivation and Behaviour (COM-B) model of behaviour change. RESULTS: Although the potential impact of FI on diabetes self-management was recognised, this important consideration was not currently core to their clinical practice. Enablers and barriers identified included: personal feelings about raising the issue, lack of knowledge of available resources, the patient-practitioner relationship, and the wider socioeconomic environment. Practical suggestions to support HCPs included: specific training on communication, access to patient support information, use of a screening tool to assess FI, and building NHS-third sector links. CONCLUSIONS: Our findings provide insight into cognitive factors, emotional processes and environmental systems impacting on HCPs' practice supporting individuals with diabetes and FI. Research with affected patients is needed to gain a better understanding of how to provide support within NHS settings.