Global creativity indices in developing countries tend to be low. In the field of education, creativity has an important role. Efforts to increase the creativity of educational human resources continue to be hyped. Creative teachers produce creative students. But, the fact is that teachers in developing countries tend to need more creativity in teaching. This study aims to analyze the influence of organizational climate in the school environment and teacher career development on teacher creativity in teaching. The sample of this study was 145 junior high school private teachers in Semarang Regency, Central Java Province, Indonesia. Statistical analysis using PLS-SEM and PLSpredict. The results showed that the school's organizational climate positively affected teacher creativity in teaching. Teacher career development also positively affects teacher creativity in teaching. In addition, teacher career development mediates the influence of school organizational climate and teacher creativity in teaching. The findings could help schools or private educational institutions to understand how organizational climate affects teachers' creativity in teaching. So that it can be used as a guideline for schools or other educational institutions to increase teacher creativity in teaching.