Employee engagement has always been an important and widely discussed subject not only for business practitioners but also academic scholars and researchers. Even many prior studies have identified a number of important antecedents of employee engagement, whether leaders’ mindfulness trait can affect employee engagement still remain unexplored. Therefore, the present study aims to examine the impact of leader mindfulness on employee engagement while also explore whether employees’ trust in leader could mediate the relationship between these two factors. This study collected data from 140 service industry employees in Vietnam. Hierarchical regression was utilized to test the hypotheses. The results revealed that both leaders’ mindfulness trait and employees’ trust in leader were positively related to employee engagement, and that trust in leader had a partial mediating effect on the relationship between leader mindfulness and employee engagement.