Introduction: Diabetes is a chronic state of the body, where pancreatic cells cannot produce enough insulin or where the body cannot efficiently use the insulin produced. Because diabetes is a very complex disease, it is essential, that the patient with diabetes is health literate. Health literacy is an important prerequisite for taking an active role in treating the disease and an active partner when meeting health workers, physicians, or institutions. Purpose: The purpose of diploma work is to accurately assess the health literacy levels of diabetes patients conducted in diabetes clinics. Methods: In the work was used a descriptive method. As a measuring instrument, a survey was conducted to determine the level of general and specific health literacy as well as the Diabetes Numeracy test. It included 72 diabetic patients who were managed in diabetes clinics. Results: The research has shown the general health literacy of respondents is good/sufficient, with the average score of all statements being 3.2. Respondents had the least problems with understanding the doctor's or pharmacist's instructions regarding the taking of prescribed medications. Rate of specific health literacy was also proven to be good, as the proportion of correct answers was 79 %. Computing caused the most problem for the respondents, where they had to calculate the number of blood sugar test strips over a period of time. Discussion and conclusion: From the results of the research, we can conclude that the level of both general and health literacy of diabetes patients has proved to be good/sufficient. Despite the good/sufficient level of health literacy, the patients must be aware of its importance and maintain it. At the same time, the patients need to be aware of the consequences of low/ insufficient health literacy Thus, their goal is to achieve the highest possible level of health literacy, as that will reduce the chances of medical complications and the treatment outcomes will be more favorable.