Title: Comparative study of transformational and transactional military and civilian leaders. Abstract: We present data corresponding to a study that had as first aim to determine if there are differences in values orientations of transforma- tional and transactional leaders while the second objective was to analyze if there are differences on values orientations between civilians and mili- tary officers. We have administered the Leadership Styles Questionnaire (Castro Solano, Nader & Casullo, 2004) and the Portrait Values Question- naire (Schwartz, 1992, 2001; Castro Solano & Nader, 2006) to 226 civilians and 138 military officers. Results showed that there are differences on values orientations between civilians and military. Military leaders were guided mostly by conservative values.