This research breaks new ground in understanding the diverse array of leadership competencies that may be needed in different leadership situations. After an extensive review of empirical leadership research, a comprehensive list of leadership competencies was developed, resulting in the production of the Leadership Competency Builder assessment tool. Too often, organizations have narrow definitions of leadership competencies and fail to consider competencies that are in most need of development in their organization. This empirically-based tool allows organizations to consider and systematically analyze their leadership competency strengths and needs.