The purpose of this study is to develop a valid and reliable measurement tool for measuring organizational health of schools. The study group consists of 429 teachers working in secondary schools in the central districts of Eskisehir/Turkey in the 2015-2016 academic year. The construct validity of the scale was examined by exploratory factor analysis. According to the results of the analysis, the scale measures a four-factor structure. The four-factor structure of the scale was confirmed by confirmatory factor analysis. The total variance ratio explained by the scale was determined as 71.101%. In order to determine the reliability of the scale, the internal consistency coefficient of Cronbach's alpha was evaluated and this value was determined as 0.915. The results of all validity and reliability analyzes show that the Organizational Health Scale can be used as a valid and reliable measurement tool in the studies that teachers will be taken as a working group.