Abstract: The main objective of this research is to explain the high school principal’s relationship between transformational leadership with psychological empowerment. This is a descriptive and correlational study which was carried out on 103 principals of high school (51 females and 52 males). Sampling method included stratified sampling proportional to the size and simple random sampling. To collect the data, Bass and Avolio’s Transformational Leadership and principal’s psychological empowerment of Spreitzer were used. Analysis of survey data was done by calculating frequencies, percentages, means, standard deviations, correlation coefficient test and stepwise regression coefficient test. The results showed that among a series of seven transformational leadership factors except for leadership that is based on non-interference which is used at an average level, the principals use other factors including: inspirational motivation, idealized influence, intellectual stimulation, contingent reward, personal considerations and management by exception at a high level, respectively. In the case of psychological empowerment variable, the mean scores of principals at all dimensions were placed in the range of high. In this regard, the dimensions of meaning and concept, ability, job satisfaction, the selection and effect obtained the highest mean, respectively. The results also showed that there was a relatively significant positive relationship between idealized influence and inspirational motivation factors of transformational leadership and all aspects of psychological empowerment. In general, there was a significant relationship between the two variables (r = 0.382). Regression test showed that the two factors of inspirational motivation and idealized influence together could predict 23.4% of changes in the psychological empowerment of principals.