Focusing on servant leadership and its outcomes are considered fairly essential in terms of its contribution to the literature. This study seeks to determine the relationships between the servant leadership of school principals and the loyalty of teachers to their principals and the constructs of loyalty to supervisors. Secondary school teachers working in Diyarbakir constitute the population of the study. 26 secondary schools were randomly selected from Diyarbakir province and the scales were applied to the teachers working in these schools. The sample consists of 202 teachers. The data were obtained with servant leadership and loyalty to supervisor scales. Validity and reliability analyzes were performed on the scales to determine whether the scales were valid and reliable or not. While analysing the data, descriptive statistics, correlation, and regression analyzes were used, respectively. It was found that the variables examined in the study had a positive and significant relationship. Regression analysis findings revealed that servant leadership predicted loyalty to supervisors and the constructs of loyalty to supervisors (dedication, extra effort, attachment, identification, and internalization) in a statistically significant way. School principals wishing to establish a sense of loyalty in schools are recommended to be aware of the positive role of servant leadership on psychological mechanisms and to have speeches and actions compatible with this type of leadership.