The present study was conducted with the goal of investigating the effects of the personality dark triad on knowledge concealment with the mediating role of organizational learning culture. The current research is based on the objective could be considered as correlational research in terms of the goal. The data collection tools applied were the standard questionnaires of the personality dark triad, organizational learning culture, knowledge concealment. The validity of the questionnaires was obtained through experts' opinions and with reliability based on Cronbach's alpha test for personality dark triad (0.75), knowledge concealment (0.77), and organizational learning culture (0.71) questionnaires and was confirmed. The statistical population of the research included the professors of Tehran University, and the sample size was obtained using available sampling method and SPSS Sample power sampling software equal to 187. The data analysis tools were regression and path analysis and SPSS and AMOS software. The findings showed that personality dark triad had an effect on knowledge concealment, and 31% of the variance of knowledge concealment was explained by the component of personality dark triad. Also, the dimensions of personality dark triad (Machiavellianism, narcissism, intellectual and psychological disorders dimension) have an effect on knowledge concealment. 38% of the variance of the knowledge concealment component was explained by the dimensions of personality dark triad (Machiavellianism, narcissism, intellectual and psychological disorders dimension). Organizational learning culture also has a mediating role in the effects of personality dark triad on the concealment of variable knowledge of organizational learning culture.
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