In this study, the relationship between principles' efficacy in change management and their democratic and autocratic leadership styles are examined. The data in the research were collected from 231 teachers and 49 principals working in the central districts of Mersin, Turkey. According to the results obtained, there is a significant difference between teachers' and principals' views about principals' efficacy in change management and their leadership styles. While principals define their leadership style as one of democratic leadership, teachers define their principles' leadership style as autocratic. Also, a positive relation at the middle level is observed between all the dimensions of principals' efficacy in change management and their democratic leadership styles. According to the results of regression analysis to understand the degree of the relation, democratic leadership style applied by the principals very much determines the dimensions of their efficacy in change management.