The purpose of this research is to examine the compliance of supervision practices with professional and ethical principles according to the opinions of teachers and school administrators. The research was carried out with a case study (case study model), which is one of the survey models. The study group in the research consists of 66 people including 18 administrators and 48 teachers, who are working in public schools in Ankara-Çubuk district and voluntarily participated in the research. In the study, data were collected with a semi-structured interview form developed by the researchers. The collected data were analyzed by content analysis method. Themes and codes were created from the answers given to the interview questions, and their frequency distributions were determined. As a result of the research, according to the opinion of the majority of administrators and teachers; it was determined that the supervisors acted in accordance with the principles of “impartiality and objectivity, equality, honesty, confidentiality, competence and professional care”. However, it was found that they did not behave in accordance with the principles of “avoiding conflict of interest, courtesy and respect”. The fact that supervisors do not engage in derogatory, humiliating, oppressive, insulting and threatening attitudes will contribute to effective guidance services. In addition, training on “effective communication” can be given to supervisors. In order to prevent the supervisors from exhibiting unethical attitudes, it is recommended that they act more sensitively within the scope of the “Regulation on the Principles of Professional Ethical Behavior to be Followed by Audit Officers” and carry out the supervision process by taking into account the relevant regulations.