Complete Article Title: The Effect of Dark Personality Traits (Machiavellianism, Narcissism and Antisocialism) on Organizational Misconduct by Explaining the Mediating Role of Organizational Mindfulness (A study on the Field of Disaster and Emergency Medical Management - Lorestan's 115 Emergency)
 Background: Organizational misconduct as a destructive or negative phenomenon has challenged common social values, norms and organizational expectations. Therefore, the study of predictors of organizational misconduct, with the aim of reducing the effect of unpleasant personality traits of employees by directing employees towards behavioral standards, policies and organizational strategies in health care systems seems necessary. Therefore, in this study, dark personality traits and organizational mindfulness were investigated to reduce organizational misconduct.
 Methods: The present cross-sectional study was conducted with the structural equation modeling approach in 2021. The target population was the staff of the 115 Emergency from Medical Emergency Management Department of Lorestan. The sample size was calculated 217 based on Krejcie-Morgan table. Divergent and convergent validity were used to determine the validity of the structures, and Cronbach's alpha coefficient and combined reliability were used to determine the reliability of the instrument. Data analysis was done using structural equation modeling through SPSS 23 and Smart PLS 3.5 softwares.
 Results: Findings showed that dark personality traits with the significant value of 6.232 and path coefficient of 0.401 had a positive and significant effect on organizational misconduct and with the significant level of 8.741 and path coefficient of - 0.455, it had a negative and significant effect on organizational mindfulness. Organizational mindfulness with a significant level of 5.187 and the path coefficient of - 0.373 had a negative and significant effect on organizational misconduct. Moreover, organizational mindfulness with direct impact factor of - 0.455 , indirect impact factor of - 0.373, direct significance level of 5.187, and indirect significance of 8.741 (- 1.96 < t < 1.96) determines the mediating role between dark personality traits and organizational misconduct. The quality of the final research model with GOF index (0.379) had a suitable fit.
 Conclusion: Given the significant role of dark personality traits and organizational mindfulness in relation to predicting organizational misconduct of the employees, while identifying and managing these traits, it is suggested that the managers of 115 emergency medical services in Lorestan, prevent the intentional violation of organizational norms by employees through strengthening the organizational mindfulness of employees.