Although frontline supervisors are responsible for on-site management, supervision, and training of direct support professionals, research on the nature, content, and skills of the frontline supervisor role is rare. In this paper we describe results of 12 job analysis and three validation focus groups constituted to describe core competencies for supervisors in organizations providing community supports for people with disabilities. The focus groups involved 146 participants, including 97 direct support professionals, 40 frontline supervisors, and 7 managers who supervise frontline supervisors. The focus groups identified 14 competency areas in which frontline supervisors need to be proficient. In each competency area, between 4 and 26 specific competency statements were identified (a total of 142) along with 340 performance indicators.