The current study examined interrelation of affectivity, emotional intelligence and personality and their roles in sport coaches’ transformational leadership style using their disposition. Data are collected from 206 sport coaches. Pearson correlation coefficient was used to analyze data. The results showed a positive deep relationship between positive affectivity with personality (r=0.251, P<0.05) and transformational leadership style (r=0.785, P<0.001) while a negative relationship between negative affectivity with transformational leadership style (r= -0.408, P<0.001). Also, the relationship between personality with transformational leadership style (r=0.408, P<0.001) and emotional intelligence with transformational leadership style (r=0.253, P<0.05) were confirmed. The results indicated that demographic variables such as age and coaching experience had a positive effect on transformational leadership style although education level was conversely related with transformational leadership style. The results of this paper showed that emotional dimensions have an important role in leading sport teams. It is suggested that sport coaches not only should be able to show their emotional skills but also should continuously develop their communicational and emotional skills.