Patients with advanced cancer and diabetes mellitus present a challenge to healthcare professionals. To establish how diabetes is currently being managed in these patients, we audited the care of patients who died in Cheltenham General Hospital over the previous 12 months with diagnoses of both diabetes mellitus and cancer. Management and monitoring of the diabetes was variable and there was little record of discussion between healthcare professionals and the patient or family regarding the diabetes. Thirty-two out of 42 patients continued to have blood sugar monitoring up to and including the day they died. We review the literature on this topic and suggest guidelines to help professionals to appropriately manage diabetes in the palliative setting at the end of life.