This study aims to determine the relationship between school principals' sustainable leadership behaviors and school effectiveness based on teachers' views. For this purpose, the quantitative method and relational design were used in the study. The study was conducted with 368 teachers working in Yozgat in the 2022-2023 academic year. Data were collected using the Sustainable Leadership Scale and the School Effectiveness Index. The data were analyzed using descriptive statistics, Pearson correlation, and multiple regression analyses According to the study results, teachers view school principals' sustainable leadership behaviors and school effectiveness as high. Environmental and social responsibility received the highest score among the dimensions of sustainable leadership. Analyses revealed that the mean scores for school effectiveness were high according to teachers' views. As a result of the research, it was found that there is a positive relationship between sustainable leadership and its dimensions and school effectiveness. Regression analysis showed that sustainable leadership is an essential factor in school effectiveness. Studies on sustainable leadership in educational organizations are limited in the literature. For this reason, perceptions of sustainable leadership can be examined in the context of educational organizations with an approach that addresses different concepts together.