Background: Benign prostatic hyperplasia is one of the most prevalent disorders in elderly men and non-malignant condition of the prostate, increases morbidity, often resulting in lower urinary tract symptoms, which can have an undesirable influence on a patient's quality of life. Aim: to evaluate the effect of educational guidelines application on the quality of life among geriatric patients having benign prostatic hyperplasia. Design: A Quasi-experimental research design was utilized to achieve the aim of the study. Settings: The study was conducted in Sohag University hospital in urology unit, and outpatient clinics. Sample: A convenience sampling of 100 geriatric patients having benign prostatic hyperplasia from the previously mentioned setting. Tools: 3 tools were utilized. Tool I: Demographic structured interview schedule: developed by the researchers and including the following four parts: Part I: It includes age, occupation, education level, and residence, Part II: It includes items to assess the chronic illness, medications used, and their numbers, Part (III) knowledge assessment for client related to benign prostatic hyperplasia, And Part (IV) health needs and health problems of patients, Tool (II): International prostate symptom score. And Tool (III): Quality of Life Scale for benign prostatic hyperplasia.  Results: Pre-educational guidelines application 80 % of geriatric patients had unsatisfactory total knowledge regarding benign prostatic hyperplasia that improved post-educational guidelines application and 84% of Them had satisfactory total knowledge. The present study revealed that 15% of the studied geriatric patients had high quality of life pre-educational intervention compared to 65% had high levels of quality of life post-educational guidelines application. There was a statistical relation between the international prostate symptoms score of the study group and their quality of life pre and post-educational guidelines application at P =0.000.  Conclusion: Educational guidelines application has a significant effect on quality of life among geriatric patients having benign prostatic hyperplasia. Lower urinary tract symptoms associated with benign prostatic hyperplasia have a significant negative impact on the quality of life of geriatric patients. Recommendations: Provide health education programs about benign prostatic hyperplasia to the geriatric patients to help them follow their management to improve their quality of life.