The present study is an attempt to find out whether there is a significant relationship between EFL teachers’ Big Five personality traits and their self-concept. In addition, ittried to examine if there is any significant relationship between teachers' teaching experienceand their self-concept. 112 EFL teachers participated in this study. They were asked to complete NEO Five Factor Inventory and Teacher Self-concept Evaluation Scale. Data were analyzed using Correlation, Multiple Regressions, and ANOVA. Results indicated thatself-concept was significantly correlated with four components of the Big-Five personality traits.It was positively related with "Neuroticism", "Openness to experience" and "Conscientiousness", but negatively related with "Agreeableness". It was also revealed that there was not any statistically significant difference among the three groups (low, mid, and high experience EFL teachers) with respect to their self-concept. The overall results of the study were discussed, and the implications for policy and practice were made.