This study examined the association between teacher educators’ personality traits and their interpersonal behavior at Farhangian University (Teacher Education University in Iran). A sample of 148 student teachers majoring in Teaching English as a Foreign Language (TEFL) at two branches of Iranian Teacher Education University evaluated their teacher educators’ interpersonal behavior by the questionnaire for teacher interaction (QTI). The teacher educators (N=17) also completed the QTI and the NEO Five-Factor Inventory (NEO-FFI). The results of correlational analyses indicated significant associations between educators’ personality traits and their interpersonal behavior. More associations were observed between educators’ personality and student teachers’ perceptions of interpersonal behavior while fewer associations were observed between educators’ personality and the educators’ self-perceptions. Moreover, the results revealed that all educators’ personality traits except for Openness were significantly correlated with the two interpersonal behavior dimensions of Influence and Proximity. When stepwise regression analyses were done for the Influence dimension, the strongest model for prediction included Neuroticism and Conscientiousness while for the second dimension, Agreeableness emerged as the sole, significant predictor of educator Proximity.