Dereje Abi (PhD)Blen Sisay2025-08-022025-08-022024-10https://etd.aau.edu.et/handle/123456789/5940The main purpose of this study is to investigate the effect of leadership behavior on project performance. To meet its purpose, primary data was collected from 76 randomly selected employees working at Azad Engineering through closed ended questionnaire. The study used both descriptive and explanatory research designs. Descriptive design was used to describe the leadership behaviors in practice at the case organization and level of its project performance. The explanatory design was set to test cause and effect relationship between leadership behaviors and project performance. The data was analyzed through quantitative approach of descriptive statics (mean and standard deviation) and inferential statistics (regression analysis). The finding of this study revealed that four leadership behaviors namely directive, supportive, participatory, and achievement-oriented leadership behaviors have significant and positive effect on project performance implying the more these leadership behaviors are in practice, the better the project performance would be. Based on the results specific recommendations to the case organization and suggestions for further study are forwarded. Key words: Leadership Behavior, Project performanceen-USThe Effects of Leadership Behavior on Project Performance: In the case of Azad EngineeringThesis