Introduction and aim: The aim of this study was to determine the frequency and type of complications of diabetes that occur among beneficiaries od Split diabetic society, investigate which factors influence the development of complications, and establish the most frequent complication in diabetic patients. Material and methods: The study was conducted on a random sample of 30 users of Split diabetic society. The survey was conducted in December 2015. and January 2016. using a questionnarie drawn up in cooperation with the mentor. The data collected from the survey was entered into a Microsoft Excel spreadsheet according to a pre-prepared chart of accounts. For processing, descriptive statistic was used. Results: The most common category of participants is 60 to 65 years of age. None of the participants were in the group 25 to 55 years of age. Among the participants females (N=16) were more prevalent, with 53% than males (N=14) with 47% participation. The largest mumber of respondents cited hyperglycemia as the most frequent complication, followed by hypoglycemia and hypertensia with the highest incidence. None of the diabetics had hyperosmolar coma, hart attack or stroke. We can take note that complications such as diabetic retinopaty, nephropaty and angina pectoris already occurs in diabetic patients treated 1 to 5 years. Conclusion: The results of our study show a high incidence of complicationd among beneficiaries of SDS. 28 participants developed some type of complication, and the most common was hyperglycemia. The study involved a small number of respondents, so we can't get a real estimate of the problems that occur among diabetics. A more detailed research should be carried out on a larger number of subjects in order to get a more accuret conclusion regarding numerous critical factors that influence the development of complications.