The aim of this study was to examine the impact of hardiness on coping styles with stress. Two hundred and seventy-four volunteer students (97 males, 177 females) from different faculties of the University of Tehran participated in this study. All participants were asked to complete Hardiness Scale (HS) and Tehran Coping Styles Scale (TCSS). Analysis of the data involved both descriptive and inferential statistics including means, standard deviations, t-test, Pearson's correlation coefficient, and regression analyses. The results revealed that hardiness was positively associated with both problem focused and positive emotional focused coping styles while negatively related to negative emotional focused coping style. Hardiness predicted coping strategies of problem focused and positive emotional focused positively, and coping strategies of negative emotional focused negatively. Different coping strategies are supposed to be influence by hardiness through increasing self confidence; reinforcing a sense of independence and autonomy, a clear sense of direction, an active approach in stressful situations; concentrating cognitive, affective, and behavioral abilities on goals; stress buffering; and positive interpersonal relationships.