Even though organizations are failing because of leadership ineffectiveness, there is no consensus on the secret behind leadership effectiveness. Therefore, this study is aimed to investigate the role of subjective organizational norms on leadership effectiveness with a specific contribution from a leader’s innovative behavior, knowledge sharing intention, and autonomy. To achieve this, I analyzed data collected from 104 Ethio Telcom employees using the ordinary least square (OLS) regression and hierarchical regression analysis. The result of the OLS regression revealed that organizational norms influence leadership effectiveness indirectly through a leader’s innovative behavior. This relationship is intensified when the leader is intended to share knowledge more. Moreover, the presence of high autonomy among leaders leads to the development of innovative behavior among those leaders, which further improves the effectiveness of leaders. Besides the above findings, future researchers should compare and contrast the above relationship among the leaders and employees. They should also test the role of other entrepreneurial variables such as risk-taking and proactiveness concerning leadership effectiveness.