The study aimed to identify the effect of moral intelligence as an intermediate variable, in the relationship between personality traits and school bullying. The sample of this study consisted of 271 students from grades (7-9) in North Al Batinah Governorate in the Sultanate of Oman. This study used the school bullying scale (Al-Busaidiyah, 2019), the short measure of the five major factors of personality (TIPI) (2019 (Aldhafri, and the scale of moral intelligence (Al Dhafari, Al Harrasi and Al Rashidi, 2019). The results of Baron & Kenny (1986) multiple regression analysis showed direct effects in the negative direction of the dimensions of personality traits (agreeableness, conscientiousness, and emotional stability) on school bullying, and the presence of direct influences in the positive direction of the dimensions of personality traits (extraversion, agreeableness, and emotional stability, and openness) on moral intelligence, as the results indicated the presence of direct effects in the negative direction of moral intelligence on school bullying. Besides these direct effects, the results of the multiple regression analysis showed by Baron and Kenny method that moral intelligence has an intermediary role in the relationship between personality traits and school bullying, through direct effects in the negative direction of the dimensions of personality traits (emotional stability, conscientiousness, and agreeableness) on school bullying through Moral intelligence. Key words: personality traits, moral intelligence, school bullying