The purpose of this article is to determine the relationship between transformational leadership of vocational school principals on vocational teachers-organizational commitment. A random sample of 340 vocational teachers responded to a three-part instrument (the transformational leadership questionnaire, the organizational commitment questionnaire and a demographic section). Means, standard deviations, Pearson correlations and stepwise regression analysis were used to analyse the data. The findings indicated that a strong, positive and significant relationship exists between transformational leadership (overall) and the organizational commitment dimension. Furthermore, the relationship between each component of transformational leadership and organizational commitment was found to be moderate, positive and significant. Finally, it is suggested that more workshops and training courses in transformational leadership should be sponsored by the Ministry of Education in Jordan to promote organizational commitment among vocational teachers. (Contains 5 tables.)