ABSTRACT: The purpose of this studyis to know the contribution of the extraversion in big five personality to organizational citizenship behavior factory employees in Indonesia automotive company. This research was conducted in one of the Indonesia automotive company (PT XYZ). The variablesused in this study are Extraversion and Organizational Citizenship Behavior. This study used a quantitative approach with survey method from questionnaire and used data from 235 employees, where the data is retrieved by using a questionnaire distribute to factory employees of PT XYZ. A data analysis technique usedis regression technique. The results of the study shown that extraversion in big five personality has an positive effect on organizational citizenship behaviour of 12.4%.