Abstract: The purpose of this study was investigating the relationship between managers' personality characteristics and job satisfaction in Martyr foundation of Mazandaran Province. The study was done in descriptive (correlation) method and 49 people were selected as the samples of the research. The applied tools in his study include tow scales: A) personality characteristics questionnaire: which measure five characteristics (Neurosis, Externalism, Flexibility, Being Scrumptious and Responsibility). B) Job satisfaction questionnaire: with 20 five-option questions through Likert Scale. The gathered data were analyzed by using multiple variable regression analysis and Pierson correlation coefficient. The obtained findings through the research showed that there is a meaningful relationship between managers' job satisfaction and personality characteristics and among the personality characteristics, responsibility and externalism are the major parts in predicating managers' job satisfaction. -there is not a relationship between neurosis and managers' job satisfaction -there is a positive and meaningful relationship between responsibility and managers' job satisfaction. -there is a positive and meaningful relationship between flexibility and managers' job satisfaction. -there is a positive and meaningful relationship between externalism and managers' job satisfaction. -there is a positive and meaningful relationship between being scrumptious and managers' job satisfaction