The knowledge levels of the teachers affect the qualifications of operations and transactions in schools. School management related knowledge of the teachers is an essential tool to reach the targets of the school. The objective of this study was to determine the school management related knowledge levels ov f the teachers. Qualitative and quantitative data collection methods were used in this study. Multiple choice questions that measured the knowledge levels of the teachers were used to obtain quantitative data. Qualitative data was obtained via semi-structured interview form. Qualitative interviews were conducted with two for each teacher who were chosen from ten different schools. The opinions of 316 teachers were evaluated in total for the quantitative data. Chi-square test was used in the analysis of the quantitative data to determine the relationship between the opinions according to the independent variable. In addition, frequency values and the percentages were determined depending on the questions. According to the quantitative results of the study, it was concluded that the teachers had middle knowledge level related to the positions and associations that were included in the school management. According to the qualitative results, teachers mainly held a view in the domains of student success, discipline and order, student absence and duties of board of teachers. As a result of the findings that were obtained with the both methods, it was concluded that the teachers had low knowledge level which affected the school management.