This research was conducted to determine the role of four dark traits of personality and organizational procrastination in the leadership styles of school principals. The current research method was correlational research. The statistical population of the research included all principals and vice-principals of schools (all levels) of Maku Free Zone (Shot, Poldasht, and Maku cities) in 2022, to number 220 people. All managers participated in the study.The reliability of the questionnaires was calculated using Cronbach's alpha coefficient of 0.83, 0.89, and 0.88, respectively, and the validity of the questionnaires was confirmed using the Factor Analysis method. Data collection tools included a four-dark personality traits scale, a multifactorial leadership scale, and an organizational procrastination questionnaire. Data analysis was done using multiple regression analysis in SPSS version 26. The regression analysis results showed that dark personality traits and organizational procrastination could predict transformational leadership style negatively and exchange and non-intervention styles positively (p≤0.05). According to the findings, it can be suggested that dark personality traits and organizational negligence play a significant role in reducing the transformational leadership style and increasing the exchange and non-intervention styles of managers, which requires more attention in management planning.