This issue of Clinics in Geriatric Medicine, guest edited by Dr. Elsa S. Strotmeyer, is devoted to Medical Complications of Diabetes in Older Adults. Articles in this issue include: Glucose Dysregulation: Pathophysiology and Prevention; Diabetic Medications and Polypharmacy; Physical Function and Disability; Diabetes and Osteoarthritis; Adiposity, Muscle Mass, and Diabetes; Exercise and Weight Loss in Diabetes Management; Diabetes and Cognition; Diabetes and Depression; Sleep Apnea and Diabetes; Diabetes and Coronary Artery Disease; and Diabetes and Balance and Falls.