In this study, it was aimed to develop an organizational personality inventory to determine the personalities of schools. For this purpose, firstly, theoretical sources on personality and its types were scanned and an item pool consisting of 87 items on organizational personality types was created. A pilot application was made to the teachers for the items in the prepared item pool. The inventory, which was finalized with the pilot application, was applied to teachers working at various school levels in the province of Kahramanmaras and determined by the "Simple Random Sampling Method" for validity and reliability analysis. As a result of statistical analyses, it was determined that the organizational personality inventory consisted of 51 items in 5 factors and the inventory took its final form. The factors of the inventory are within the framework of the five factor personality model, extroversion, agreeableness, conscientiousness, neuroticism-emotional stability, and openness to experience.