The purpose of this study of school counselors was to examine the relationship between aspects of supervision and self-efficacy. Satisfaction with supervision, the presence of noncounseling supervisors, role conflict, and role ambiguity were examined in relation to school counselors' feelings of self-efficacy. The study also included previously established individual factors related to school counselor self-efficacy including gender, years of experience, teaching experience, and training and use of the ASCA National Model. A multiple regression was used to create a predictor model for school counselor self-efficacy using these supervisory and individual factors. Supplemental analysis examined factors that predicted use of the ASCA National Model. Implications for practice and suggestions for future research are included. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]