Impulsivity is the fundamental aspect of human behavior that has been reflected in principal theories of personality in concepts of traits and sub-traits and considered as a different structure in every person. The aim of this study was to predict the attitude toward infidelity based on impulsivity and personality traits. The research method was correlational. The study population consisted of all those who had referred to family courts, counseling centers and welfare organization of Babolsar city whom 150 participants were selected. Participants responded to NEO personality inventory, attitudes toward infidelity scale, and dickman impulsivity inventory. The results showed that the attitude toward infidelity was correlated negatively with agreeableness, while it was correlated positively with conscientiousness, openness to experience, extraversion, and neuroticism. Results also showed that there was a significant positive correlation between attitude toward infidelity and impulsivity. It was also found that personality traits were significant predictors of attitude toward infidelity and the obtained model gave 0.52 of the variance. The results of this study demonstrated the importance of personality traits for counselors and psychotherapists to evaluate these factors and do all their efforts in order to identify the influencing factors and obstacles