This study investigates how trainee teachers perceive their supervising teachers' supervisory competency. Through a questionnaire that was specifically developed for this study and which contained open-ended questions, student teacher candidates were asked to comment on their supervising teachers' competency in preparation for supervision, instructional planning and reflection, and collegial supervision and effective mentoring. Data for this study was gathered from 690 student teachers who were in their last year in college pursuing a teaching credential. The results indicated that the student teachers rated their supervising teachers' competency in supervision as poor to partially competent. Although there is no significant relation found between the gender and fulfillment of supervisory duties, the main significant finding was between supervising teachers' experience in teaching and completion of the supervisory role. The results showed that the younger or less experienced supervising teachers demonstrated better supervisory skills. Furthermore, our results indicated that although experience is important, it should not be the only criterion for selecting supervising teachers for supervisory duty. The appendix contains: (1) Supervising Teacher Competency Scale (STCS). (Contains 3 tables and 2 figures.)