This study examined the relationships between organizational innovativeness levels of schools and school administrators' demographic characteristics, school climate, school leadership, and job satisfaction. To this end, it employed a correlational design. The sample consisted of 808 school administrators working in primary schools, lower secondary schools, and high schools in Turkey. The participants took the Organization for Economic Cooperation and Development (OECD) Teaching and Learning International Survey (TALIS, 2018). The study revealed that demographic characteristics of schools, including school size, adequacy of resources, and personnel, affect organizational innovativeness levels. In addition, school climate and school leadership were significant predictors of organizational innovativeness levels. The other predictors of schools' organizational innovativeness levels were lack of resources and human capital and job satisfaction.