This study aims to identify the impact of knowledge management through its dimensions; namely knowledge creation, storage knowledge, knowledge sharing, knowledge application and technology knowledge on organizational effectiveness based on the managers’ attitudes in private banks in the Erbil city in Kurdistan region, Iraq. To achieve the study objectives, a questionnaire was constructed consisting of (40) questions distributed to a sample of (80) managers and supervisors, (76) of which were returned, while (69) were valid for statistical analysis. The main objective of this study is to design a default model and test in the study field in order to understand how managers can successfully implement the knowledge man-agement to achieve the organizational effectiveness. The study found that knowledge management had an impact on organizational effectiveness according to the study samples per-spectives. Based on the results, the study presents a set of recommendations regarding the knowledge management which most importantly the private banks should adopt in a logical sequence. This could contribute in achieving an organizational environment supportive of enabling an environment to the practice of radical changes.