Background: Diabetes in the elderly is emerging as one of the most important public health problems of the 21st century. In developing countries, the majority of people with diabetes are in the age range of 45-64 years. The aim of the study was to assess knowledge and practices of the elderly diabetic patients and Plan, implement and evaluate the effect of health educational intervention on the control of diabetes among elderly. Subject & Methods: Research design: A quasi-experimental design . Setting: The study was conducted at the diabetic out-patient clinic, Ismailia University Hospitals followed by home visit to elderly. Subjects : A purposive of 100 elderly diabetic. Tools of Data Collection: Four types of tools were used for collecting data, include, questionnaire, anthropometric measurement, food roster, observation sheet. Results: revealed present of statistical significant difference between pre-post and follow up the level of knowledge among the study subjects in all items of knowledge (P=<0.000). Also significant statistical difference of all items of nutrition between pre, post and follow up post health education intervention. Also, elderly practice improved regard practice of blood sugar analysis and foot & nail care. Conclusion: the elderly knowledge & practice related to diabetic control improve post health education intervention. Recommendation: Health education of elderly & their caregiver about diabetes control, booklets contain information about diabetes & its management should be available in all health care setting