The purpose of this study was to investigate the relationship between personality dimensions of employees and work addiction in Management and Planning Organization of Hamedan. This study was descriptive-correlation and it was also an applied research in terms of its nature. The statistical population included all employees in Management and Planning Organization in Hamedan who worked in 2016 and their total number was 74 subjects. In this study, the statistical sample of employees was estimated up to 62 individuals using Morgan and Krejcie tables with simple random method. The measuring tool for personality dimensions was NEO 50-item short form questionnaire and one for work addiction was Spence and Robbins's 20-item questionnaire. The results of Pearson correlation and regression analysis showed that all personality dimensions of employees had a significant relationship with work addiction which among them, extraversion, flexibility and accountability dimensions had a negative correlation with work addiction. Also, altruism and flexibility dimensions can predict work addiction, respectively.