Abstract: Transformational leadership style is an effective and widely practiced within the organization including in schools. Transformational leadership is reported to have a big influenced on the behavior of individuals within the organization. This study was aimed to identify the effect of transformational leadership of principals towards teachers innovativebehavior in the school. This is a cross-sectional survey involving 346 secondary school teachers in Kedah (Peninsular Malaysia). The instrument used was the Multifactor Leadership Questionnaire (MLQ) and Innovative Behavior Instrument (IBI). The results of the study hadshownthat transformational leadership principalshad affected teachers innovative behaviors. This study also found that the effect of transformational leadership had contributed to innovative teachers behaviors. Therefore, transformational leadership should be practiced by all school leaders to improve the behavior of innovative teachers, megalithic thus improving school performance.