Abstract This thesis aims to discover the role of employee engagement in human sigma implementation in the Egyptian banking sector. To do so a research model was formed based on the previous studies and the literature review and 3 main hypotheses formed. After making the hypotheses questionnaire was developed based on the previous studies and the literature review, after designing the questionnaire the researcher distribute the questionnaire to different sample units one was distributed to the different three managerial levels (Topline- Middle line- First line) to the managers of public banking sector represented by manager of ElAhly National Bank in Egypt (NBE) and to the managers in the different managerial levels of banking sector private sector represented by managers of Commercial international bank (CIB). The researcher has distributed 291 questionnaires and received valid responses about 145 surveys. After collecting the survey both from managers from private or public sector hypotheses has been tested from managers' side regarding the financial and non-financial returns, management support and career growth to determine the extent of employee engagement. Also testing hypotheses regarding the organizational efficiency in terms of Employee perspective of quality improvements, employee satisfaction and for customers' perspective of quality improvements and customer satisfaction. Then the researcher reached to certain recommendations to apply the human sigma concept in the Egyptian banking sector to improve the organizational efficiency through Training and orientation for employees, improve the whole organization with a clear vision supported by the top management. The researcher then ended up this research with certain recommendations for human sigma implementations and recommendations for future researches.