Background: Postoperative delirium is a life-threatening medical emergency which is associated with greater morbidity and mortality among geriatric patients undergoing hip fracture surgery. It a highly prevalent clinical syndrome and has negative impact on the geriatric patients, their families, health care systems, and whole community. In this context, implementing preventive nursing interventions in order to prevent or decrease incidence of postoperative delirium is a valuable priority. Objective postoperative delirium among geriatric patients. Design: a quasi-experimental research design. Setting: The orthopedic department of El-Hadara Orthopedic and Traumatology University Hospital. Subjects: The study included eighty geriatric patients. Tools: Five tools were used: 1) Saint Louis University Mental Status Examination, 2) Geriatric Depression Scale–Short Form, 3) Socio-demographic and Clinical Data Structured Interview Schedule, 4) Delirium Environmental Risk Assessment, 5) Delirium Index Scale. Results: Findings of the present study revealed decrease in the incidence of postoperative delirium among the study subjects as compared with the control group with a statistically significant difference (P=0.009).Conclusion: Implementing the nursing interventions program resulted in a statistically significant reduction in the incidence of postoperative delirium among the study subjects as compared with those in the control group. Recommendations: Develop in-service training programs for nurses about postoperative delirium at different surgical wards to identify high risk geriatric patients and implement early preventive strategies.