The aim of this study is to investigate the relationship between the ethical leadership of school principals and organizational trust of teachers in the first year of secondary education in Ardabil city. Ethical leadership, as a style of leadership based on values ​​such as honesty, justice, responsibility, and respect for employees, plays an important role in the formation of organizational attitudes and beliefs. The present study is applied in terms of purpose and descriptive-correlation in terms of method. The statistical population of the study included male and female teachers working in the first year of secondary education in Ardabil city in the academic year 1404-1405, from which a sample was selected using the stratified random sampling method. The ethical leadership questionnaire and the organizational trust questionnaire were used to collect data, and their validity and reliability were confirmed. Descriptive statistics including mean and standard deviation and inferential statistics were used to analyze the data. The normality of the data was examined and confirmed with the Kolmogorov-Smirnov test. Structural equation modeling was used to test the research hypothesis. The results showed that there is a positive and significant relationship between the ethical leadership of school principals and the organizational trust of teachers, such that increasing the ethical behaviors of principals leads to an increase in the level of teachers' trust in the organization. Based on the research findings, it can be concluded that ethical leadership plays an effective role in strengthening the organizational trust of school principals. Principals who observe fairness in decision-making, behave honestly, and respect the professional dignity of teachers pave the way for creating sustainable trust in the school environment. Therefore, paying attention to the development of ethical leadership in schools can lead to improving organizational relations and promoting the organizational health of the educational system.