The present research aims to test the effects that our coaching program had on the leadership style adopted by a group of middleand top managers with at least 5 years of experience in the department or team they were leading.

The initial phase of the study involved 144 participants aged between 24 and 51 years old (Mage = 34 years) who completed the Multifactor Leadership Questionnaire (e.g., Bass, 1999). As a following step, a number of 45 managers have been randomly selected in order to be included in the coaching program but 4 of them gave up before the end of the training period.

The statistical analyses that included 83% of the remained managers, have confirmed a significant improvement of the leadership abilities after the coaching sessions. Thus, following the coaching sessions, managers have obtained higher values for the transformational and transactional leadership and perceived themselves as being more thorough, more influential towards people around, more able to help their subordinates develop, as well as having enough power to stimulate teamwork and boost trust among their coworkers.