The purpose of the present study was to investigate the relationship between social adjustment and irrational beliefs among university students. The other aim was to examine mediatory role of coping with stress styles. For those purpose, 280 subjects (141 female and 139 male) were selected randomly from Urmia University students. Joneُs irrational beliefs test (IBT) (Zolfaghari Motlag, 1377), Endler and Parker coping styles inventory (Rodger et.al, 1993) and Bell΄s adjustment scale ) Warbah et.al, 20007) were used. The data were analyzed by Pearson correlation and hierarchical regression. The findings revealed that irrational beliefs had negative relationship with student social adjustment and its components could predict adjustment (P<001). In addition, the analysis of regression showed that avoidance coping with stress style did play meditative role between irrational beliefs and social adjustment. According to the results, it  may be concluded irrational beliefs change will help better social adjustment.

Keywords: Irrational beliefs, Social Adjustment, coping with stress styles, University Students