The research was carried out to develop a measurement tool for measuring self-regulated learning skills of secondary school students. For this purpose, the validity and reliability study of the "Self-Regulation Learning Questionnaire" was conducted on 688 students who studied in different classes in the middle school (fifth, sixth, seventh, eighth grade) and selected by random sampling method. As a result of the exploratory factor analysis conducted to ensure the construct validity of the scale, a five-factor structure consisting of 39 items was obtained. These factors are "1. Studying Method, 2. Self Evaluation, 3. Receiving Support, 4. Time Management and Planning, 5. Seeking Information". The Cronbacheris Alpha value of the scale was 0.94. Confirmatory factor analysis (CFA), which was conducted to test whether the five-factor structure of the scale was consistent with the previously defined factor structure, supports the structure obtained. These results show that the Self-Regulated Learning Questionnaire is an appropriate tool for the measurement of self regulated learning skills of secondary school students.