This study aims to determine the effect of Transformational Leadership on Organizational Climate, Trust, and Knowledge Sharing. And the influence of Organizational Climate and Trust in Knowledge Sharing. The subjects of this study were managers and supervisors level on BUMN companies in Yogyakarta. The number of samples was 150 respondents using convenience sampling techniques. Data is processed using AMOS. The results showed that Transformational Leadership had a significant positive effect on Knowledge Sharing, Transformational Leadership had a significant positive effect on Organizational Climate, Transformational Leadership had a significant positive effect on Trust, Organizational Climate had a significant positive influence on Knowledge Sharing, and Trust also had a significant positive effect on Knowledge Sharing . Finally, this research can be used as a review of the effect of Transformational Leadership.