Background: Mistreatment is prevalent grievance among senior citizens. Aim of the study: To assess types of mistreatment among elderly patients with chronic diseases. Research design: This study employed a descriptive research approach. Setting: The research was conducted in outpatient Al- Azhar University Hospital clinics. Sample: The overall size of the sample was 420 patients Tools: To gather information for this, three tools were used. The 1st instrument: Structured interview questionnaire for patients include personal characteristics and assessment of medical history, the 2nd tool: Hwalek – Sengstock Elder Abuse Screaning Test, the 3rd tool: Geriatric Mistreatment Scale. Results: Showed that 44.5% of studies elderly patient had hypertension, and only 28.6%, 18.1% of them had diabetes and heart disease respectively. The majority of elderly patient were non abuse 85.7% and only 14.3% of them were abuse. Conclusion: The majority of elderly patient were non abuse and only one quarter of them were abuse. Recommendations: offering educational programs to help senior citizens learn more about types and risk factors of mistreatment especially among elderly with chronic disease. Family and caregiver