The purpose of this study is to determine the factors that cause students drop out of school in secondary education. This is a descriptive survey study and the quantitative research method was employed. 2985 secondary school dropouts participated in the study and the data was collected through "Secondary School Dropout Questionnaire". According to the findings, participants had to drop out because of financial problems, failure, absenteeism, enrolling to open education, family problems, disliking the school, having problems with teachers and administrators, studying for university entrance exam, health problems, marriage, the idea that attending the school is unnecessary, migration, having to take care of parents in need, and disciplinary penalties. Based on the findings, it is suggested that especially school administrators and teachers, all practitioners and decision-makers need to give priority to school dropout problem. In addition, for student, teacher and administrators, curricular and extracurricular activities and programs to reduce school dropout should be prepared and put into practice.