The aim of this study is to examine the relationship of teachers with the school environment from an ethical point of view, according to teachers' opinions. In the research, case study design from the qualitative research method was used. The research data were obtained by face-to-face interviews with 20 teachers working in Sultanbeyli, Pendik and Kartal districts of Istanbul. The data collection tool of the research is the semi-structured interview form developed by the researchers. The data obtained from the interviews were analyzed with the descriptive analysis technique and the participant opinions were gathered under five themes (ethic behaviors of teachers, ethical decision making, increasing ethical sensitivity, unethical behaviors and harms of unethical behaviors). As a result of the research, it was determined that the ethical competencies of the teachers should be increased, that the teachers should be a role model for their followers, and that teachers should have a large number of ethical competencies, and that teachers had some unethical behaviors that harm the environment and students. In order for teachers to make ethical decisions in their relations with the environment, it is considered important that decision makers implement functional policies to increase their ethical awareness level.