The research purpose is to assess the relationship between the locus of control and the university students’ personality traits; therefore, 300 university students were randomly selected from Azad University, Karaj branch and tested with regard to five personality traits and locus of control. Results indicated that neuroticism (anxiety, aggressiveness, depression, shyness, impulsivity and vulnerability (are positively, significantly correlated to locus of control. Furthermore, conscientiousness, extraversion and intellect are negatively, significantly correlated to one another.