Background: Quality management strives to create a positive, open, and honest culture that provides health care services judiciously. The quality process is designed to monitor and trend problems. Most quality measures consider the structure, process, and outcome standards as frameworks.  Aim: the present study aimed to assess quality of health care in the adult critical care units  as perceived by nurses and patients. Subjects and methods: A descriptive study was used with a sample of (70) nurse and (116) patient. The data were collected by using two tools; Nurses' perception questionnaire and Patients' perception questionnaire. Results: The study results revealed that  a statistically significant difference was found between nurses' and patients' perception regarding the structure factor and process factors affecting quality of health care Conclusion: It was concluded that the process and structure factors were the most important factors as reported by nurses and patients, while the outcome factor was the lowest one as reported by nurses. Recommendation: Nursing administrators should be properly selected and prepared for their role as efficient leaders to be a source of empowerment for their staff and the nursing profession,Providing continuing supervision and evaluation of nurses for the detection of any deficit in their performance and correction of the weakness and patients must continuously asked or assessed for their opinion or perception regarding the quality of care