It was aimed to examine the mediating role of authentic behavior on mindfulness and valued-living in this study. The study group involved the participation of a total of 270 undergraduate students and the students' age was between 18-28 years old. The group's mean age was 20.4 (Sd=1.44). The data were collected through The Mindful Attention and Awareness Scale, Valued Living Questionnaire and Authenticity Scale.The hierarchical regression analysis was used to analyze the mediating role of authenticity. The results of this study showed that authenticity has a mediating role on the relationship between mindfulness and valued-living.