The present study aimed to explain the relationship between critical thinking and social tolerance among the students of the faculty of psychology and educational sciences of Zahedan University. The study methodology was descriptive-correlational. 294 students were selected from the faculty of psychology and educational sciences of Zahedan University in BA and MA courses by the stratified sampling method by Morgan Table. For data collection, a researcher-built questionnaire of social tolerance and the critical thinking questionnaire by Ricketts were applied and the reliability of these two questionnaires by Cronbach’s alpha was 0.84 and 0.85, respectively. The results of the correlation test showed that there was a positive and significant relationship between critical thinking and political, ethnic, nationality toleration, toleration against coverage and relationship and total toleration. The stepwise regression analysis showed that critical thinking dimensions explained the variance of social tolerance.