In this study, we aimed to determine the quality indicators in separate special education schools that only educate individuals with special needs from the perspectives of teachers. We collected data from 82 special education teachers included by maximum diversity sampling using a semi-structured interview form. We conducted a content analysis using the MAXQDA qualitative data analysis program. As a result of the study, we identified six main themes as quality indicators in separate special education schools. These were teacher and administrator qualifications, school environment (social and physical), curriculum and educational process, family interest and attitude, policies and practices, and child-related factors. Moreover, several factors such as teachers with degrees in special education, materials, social perspective, evidence-based practices, family support, and individualised education programs were found to play an important role as quality indicators in separate special education schools. Improvements in quality indicators in separate special education schools can contribute to student outcomes.