[영문]Continuing interest in social work leadership is occurring in the 21st century. This study examines leadership in human service organizations. Members of ACOSA and the National Network for Social Work Managers were asked to consider an organization, and then to assess the leadership style of a leader using the MLQ-5R (Multifactor Leadership Questionnaire), along with characteristics of the organization within which the leader worked. A transformational (vs. transactional or laissez-faire) leadership style was most often attributed to the leaders by respondents. The transformational leadership style and the “democratic” (vs.“authoritarian”) organization were correlated with successful leadership outcomes.