The purpose of this study was to investigate the relationship between authentic leadership and the three dimensions of employee well-being. Furthermore, attachment insecurity was considered as a mediating factor between authentic leadership and the three dimensions of employee well-being. Data were obtained from a field sample of 212 health care providers with patient contact at five hospitals in the North East of Iran. Initially, collected data were analyzed with multiple confirmatory factor analyses. Then, structural equation modeling was applied to test (...) proposed hypotheses. First, it was shown that authentic leadership negatively impacted attachment insecurity. Second, attachment insecurity proved to be a factor impinging upon job satisfaction. On the contrary, higher levels of attachment insecurity was associated with higher levels of perceived stress and stress symptoms. Third, it was revealed that attachment insecurity partially mediated the relationship between authentic leadership and job satisfaction and fully mediated the relationship between authentic leadership, perceived stress, and stress symptoms. According to the literature of authentic leadership, this is one of the first research studies, and literally the first in the East exploring the effects of authentic leadership on the exclusive combination of dimensions offered in this paper. Moreover, researchers in the field of management have not delved enough into attachment and its antecedents and consequences in leader–follower relationship. This is one of the first studies to provide evidence of the relationship between authentic leadership, attachment security and employee well-being. As a further analysis, the final model was separately put under the two different lens of gender and some interesting findings were discussed in the discussion. (shrink)