The aim of this study was to determine the relationship between transformational leadership and spiritual well-being among elementary school principals. A correlational research or ex post facto method was used in this study. The sample population comprised 141 subjects, of which 69 were male and 72 were female. Bass and Avolio's Transformational Leadership Questionnaires and Ellison's Spiritual Well-Being Scale were used. The results obtained indicated that the assessment of domains related to transformational leadership style would show, relatively, the importance of a "without intervention" leadership style; however, values for passive avoidant leadership, management-by-exception and contingent reward were greater than the other dimensions used. There was a positive correlation between spiritual well-being and its dimensions, as well as transformational leadership and its dimensions, excluding the religious dimension and intellectual stimulation, contingent reward, management-by-exception and passive avoidant leadership, and between dimensional being and leadership without intervention in other dimensions (though low). The results of this study also showed that the spiritual well-being dimension can predict 12.7% of the behavior of transformational leadership of principals.