The purpose of this study is to determine whether the school climate affects school effectiveness. For this purpose, quantitative research relational screening model was used in the study. The research was conducted in 2018-2019 academic year and 341 teachers participated voluntarily. In the research, The Organizational Description Climate Scale for Elementary Schools (OCDQ-RE]) developed by Hoy and Tarter (1997) and adapted to Turkish culture by Yilmaz and Altinkurt (2013) was used together with The School Effectiveness Index, which was developed by Hoy (2014) and adapted to Turkish culture by Yildirim (2015). The data were analyzed by correlation and regression analysis. According to the findings, school climate predicts school effectiveness. The findings were discussed with the results of other researches in the literature and suggestions were made to the administrators and teachers.