Diabetes is one of the main causes of death and around 4.5-5 million people suffer from it in Iran. Therefore, having information about this disease and self-care activities is essential. It seems that measuring the level of health literacy is important. This research aims to investigate the appropriateness of the available information and educational resources as well as the level of the health literacy of diabetic patients attending health centers in Shiraz (Iran).In this descriptive research, some available information resources were prioritized by diabetic patients, and educational planes were chosen to assess their appropriateness. The study population included 400 diabetic patients who were selected through stratified random sampling. Their level of health literacy was measured by TOFHLA questionnaire. The findings showed that 87.5% of the patients had regular doctor appointments as a resource for getting information; however the information given by the physicians are little and the level of the patients` health literacy is in marginal level. Marginal health literacy is a threat for diabetics whereas they need to have adequate knowledge and skills about controlling and improving their disease; thus, providing understandable information and educational materials for patients is expressed as a way to enhance their health literacy level. Based on their knowledge and skills hospital librarians, can work as health literacy educators in health centers and hospitals, and as role-players in promoting health literacy community.