In the last decade, companies have increasingly understood the value of knowledge management for obtaining competitive advantage. The two main dimensions of knowledge management are organizational learning and organizational forgetting. Despite much research that has been done about knowledge management and organizational learning, not much studies have been conducted so far on organizational forgetting and how to handle it. The purpose of the present study is to consider the relationship between the most recent leadership approach called authentic leadership and the concept of intentional organizational forgetting and psychological capital, which are suggested as a conceptual model for the first time. Research methodology is descriptive-correlational, and in terms of purpose, it is an applied study. Statistical population includes the employees of National Oil Products Distribution Company of Sistan and Baluchestan Province, out of which 165 individuals were selected through random sampling. Data collection tool includes the standard questionnaires of authentic leadership, organizational forgetting, and psychological capital, whose content validity was confirmed by experts’ comments and its reliability was confirmed by Cronbach’s alpha. In this research, correlation test, regression test, and structural equations model were used, and data were analyzed using LISREL Software. Results indicate that authentic leadership directly and indirectly affects intentional organizational forgetting through psychological capital. Also, the psychological capital, as a mediator variable, is relatively effective in the relationship between authentic leadership and intentional organizational forgetting.