Project management highly requires effective leadership in managing resources and people in high complexity projects. Despite extensive studies in the areas of project management and studies of leadership, the extent to which leadership influences project success has not been fully explored nor have the styles of effective leadership in project environments. Failure in managing projects is determined as the main challenge due to ineffective leadership in UAE. Therefore, the objective of this study is to develop a leadership model for effective project management. The research adopted a quantitative research approach along the research process. The study was carried out within UAE Abu Dhabi National Oil and Gas Company (ADNOC). The results for this study were based on questionnaires distributed to the 417 respondents which are employees in the project management department in ADNOC. the results for this study were based on questionnaires distributed to the 417 respondents which are employees in the project management department in ADNOC. the data have been gathered were then analyzed using Analysis of Moment Structures (AMOS) in Structural Equation Modelling (SEM). The results show that competency leadership, servant leadership, behavioral leadership has a significant impact on the success of project management, while situational leadership was found not significant in this study. Thus, the results from this study are benefitted the top management of ADNOC, to helps them in deciding on project management in an organization.