This study investigates the effects of servant leadership on employee attitudes, behaviors, and psychological climates. In Study 1, the empirical results are based on data for 284 employees from 12 different organizations, and in Study 2, the results are based on data for 286 employees from 15 different organizations. The results show that servant leadership is positively and significantly related to organizational citizenship behavior, job satisfaction, and psychological climate. The relationship between servant leadership and job satisfaction is also partially mediated by psychological climate. With these results, this study contributes to research showing that leadership has both direct and mediating effects on employee attitudes and behaviors.