The Council for Accreditation of Counseling and Related Educational Programs (2016) and the American School Counselor Association (2016) require supervisors to have "relevant" training in supervision, but do not specify the type of training that should be acquired. This study determines if site supervisors who have had formal training in supervision, as indicated by graduate coursework, report higher self-efficacy and receive higher ratings on evaluations from school counseling internship students than site supervisors who have not. We found no effect of supervision training on school counselor interns' (n = 60) supervisor ratings using the Student Counselor Evaluation of Supervisor form (Boylan, Malley, & Reilly, 2001). Supervisors (n = 58) who had training (e.g., in-services, continuing education, modules of graduate coursework, university workshop) rated themselves higher on the Site Supervisor Self-Efficacy Survey (DeKruyf & Pehrsson, 2011) than supervisors who had no training and those who completed a graduate supervision course.