Past research has revealed that individuals' job mobility is affected by factors such as job satisfaction, specific career enhancing attributes and job availability. This study examined personality factors predicting voluntary internal and external job mobility. Three types of voluntary job mobility measures were studied: dissatisfaction changes, job improvement changes and job rotations within companies. These mobility measures were related to the Big Five personality factors, sensation seeking and adult attachment. Results showed that demographic variables and sensation seeking contributed to the variance in external job changes. Internal job rotations were not related to any of the demographic and personality variables.