Diabetes is a syndrome that is caused by an absolute or relative deficiency of insulin, or an insulin action and is a result of hyperglycemia. We have two types of diabetes, and they are: diabetes type 1 (insulin depended) and diabetes type 2 ( insulin – independent ). In pregnancy there is a special form of diabetes, and it is called gestational diabetes. Gestational diabetes is a diabetes that is diagnosed for the first time during pregnancy. It belongs to a group of high-risk pregnancies, and requires intensive monitoring and control up to childbirth. Diagnosis is made by the oGTT blood test (2-hour oGTT at a load of 75 grams of glucose). The goals of treatment of gestational diabetes are to achieve the state of euglycemia, to prevent ketoacidosis, and to prevent fetal risk. In the case of a mild increase in blood sugar, a sufficient therapeutic measure is a diet. Insulin treatment is recommended when glucose is more than 5,1 mmol / L. Maternity care for pregnant women suffering from gestational diabetes is based on the assessment of the pregnant woman and her condition. A health care plan is drawn up by detecting difficulties and disturbances. Caring is carried out continuously, and goals and results are regularly evaluated. Pregnant women should provide support during the course of health care in order to avoid the occurrence of anxiety. Disclose in a timely manner the failure to comply with instructions or inconvenience, and provide proper education. The nurse plays an important role in educating a pregnant woman suffering from gestational diabetes. She should advise the pregnant woman about the importance of physical activity, nutrition, about her illness, outcomes and complications that can come to her. The aim of this paper is to illustrate the basic elements of the disease, explain how the disease can affect the pregnant woman and the fetus, identify possible complications, treatments, diagnosis, and care for pregnant women through delivery through care.