This study was aimed to find a school principals' instructional leadership model. This study used the multicase qualitative approach. The instrument was the researcher himself. The data were collected using the in-depth interviews, participant observation, and documentation. The subjects were the school principals, vice principals, and teachers taken using the snowball sampling technique. The key informants were the school principals. The object of the study was the persons, concept, places, and activities. The stages and the data analysis used Creswell's (2014) model. The data validation was carried out using the credibility, transferability, dependability, and confirmability criteria. The findings showed that the school principals' instructional model followed the following cycle: an understanding of the definition of instructional leadership, the objectives and benefits of instructional leadership, indicators of effective instructional leadership, and practical ways of implementing the instructional leadership.