ABSTRACT
This study aimed at assessing the validity and reliability of the Farsi version of Social Interaction Anxiety Scale [SIAS]. In a cross-sectional study, a sample of 150 students of Payam Noor University were selected by convenience sampling. After forward and backward translations, the Farsi version of SIAS with the Brief Fear of Negative Evaluation [BFNE] and the Social Phobia Inventory [SPIN] were used for data collection. Pearson's correlation and independent T test were utilized to analyze data. Test-retest reliability was 0.79 [Cronbach's alpha=0.90]. Also, SIAS could differentiate males and females; as expected females scored higher [p<0.035]. There was a significant correlation between the SIAS and the BFNE [r=0.54, p<0.0001]and SPIN [r=0.68, p<0.0001]. The Farsi version of SIAS has acceptable validity and reliability for use among the Iranian students