Background: Increases in the rate of elderly population both in the world and in our country raises the problem of elderly care. Aim: This study was carried out to evaluate the usability of the Omaha System in determining the health needs of elderly and in the nursing care provided to the elderly living in residential home provided in the context of elderly health services. Methods: This research was a descriptive study. During the study process, 30 elderly people living in the Keçiören Residential Home and Social Welfare Institution, in Ankara followed between 9 June – 25 July 2008 and nursing care implemented by using Omaha System. “Elderly assessment form “designed by the researchers was used for assessment of elders’ health status. Omaha System was used to the determination of the nursing diagnoses and interventions and to the evaluation of the results of nursing interventions implemented. Findings: According to the Problem Classification Scheme, the most frequently nursing diagnosis coded in physiological domain and the least frequently nursing diagnosis coded in environmental domain. During the study, a total of 1067 nursing interventions were implemented, and health teaching, guidance and counseling (27.8%) was the most and case management (22.2%) was the least category used. Conclusion: Omaha System has been found useful in elderly health care and some diagnosis ethiology such as inadequate lighting, body image, eye itching/gum, wound in the mouth, orthostatic hypotension, not knowing his/her diet, difficulty falling asleep, irregularities in sleep and rest and making the wrong perineum hygiene should be added in nursing diagnoses.