This study has explored the link between school principals' transformational leadership style to teachers' organizational commitment in Addis Ababa government secondary schools employing correlational research design. Stratified random sampling technique was applied to draw a representative sample of 385 teachers for the study. The result of this study shows that transformational leadership is less practiced in Addis Ababa government secondary schools. The study further reveals that transformational leadership is positively and significantly related to teachers' organizational commitment. Hence, improving the exercise of transformational leadership in schools may heighten the teachers' organizational commitment. Further research is required with more sample of the study including school principals, students and parent teacher association to examine the link in more detail in Ethiopian context.