Drawing on organizational support theory, we examine the effects of authentic leadership behavior on employee outcomes at work. This study mainly focuses on the mediating roles of perceived supervisor support (PSS) and perceived organizational support (POS) and the moderating role of trust in leader. Using data from 384 respondents in several business organizations in Korea, this study tests a mediation mechanism in the relationship between authentic leadership and followers’ turnover intention and organizational citizenship behavior (OCB). First, the analysis shows that authentic leadership has a positive relationship with employees’ OCB and a negative relationship with their turnover intention. Secondly, this study finds that PSS and POS mediate the relationship between authentic leadership and employee work outcomes. Specifically, supervisors’ authentic leadership influences employee performance by increasing their PSS and POS. Lastly, the analysis finds that followers’ trust in leader moderates the relationship between authentic leadership and PSS. Managerial implications and future research directions are discussed.