Although fewer individuals with type 1 diabetes mellitus (T1DM) drink alcohol, the potential and severity of harm associated with its consumption is higher in persons with diabetes. Alcohol use affects glucose metabolism and results in various potential adverse effects both from acute ingestion and chronic ingestion in persons with T1DM. The purpose of this article is to describe the effects of alcohol on glucose metabolism and diabetes control in persons with T1DM and propose counseling pearls for providers working with patients in this population.