Several medicinal herbs have been used by the rural communities and underdeveloped regions for the treatment of diabetes mellitus. However, not all are evaluated for their efficacy. Due to higher costs and severe side-effects of synthetic drugs, traditional medicines are being prescribed to overcome these problems. Diabetes is increasing at alarming rate worldwide. It is caused by the deficiency of insulin. Many plant extracts contain certain compounds which are helpful in controlling the sugar level. This review deals with the applications of medicinal plants in treating diabetes.