This study aims to analyze the performance of school principals during the COVID-19 pandemic. This study also aims to analyze the effect of principal's performance, teacher competence and school climate on teacher's performance. In addition, this paper investigates the mediating role of teacher competence and school climate on the relationship of principal's performance and teacher's performance. The sample in this study was schoolteachers in Central Java. The sampling technique is purposive sampling. The research respondents were 200 public and private teachers consisting of elementary, junior high, and senior high school teachers. The data collection method used was questionnaire. The questionnaires were distributed online via google forms. The data analysis method used was path analysis. The results showed that the principal's performance was in the good category in terms of five dimensions (managerial, supervision, entrepreneurship, social, and personality). The principal's performance significantly influences the teacher's performance. The principal's performance is also a significant determinant of school climate, although it has not been proven to significantly influence teacher competence. Other results indicate that school climate and teacher competence are significant determinants of teacher performance. School climate and teacher competence have a mediating role in the relationship between principal's performance and teacher performance. The implication of this research is the importance of improving the performance of school principals during the pandemic because it will be able to significantly determine the school climate and teacher's performance. Strengthening the performance of school principals can be done by providing regular direction and monitoring by authorized parties such as school supervisors, education offices, and other officials.