Lecturers and staffs play a very important role to achieve organizational goals in the university. The accomplishment of goals is the accumulation of each individual performance.The research is to test the association between the personality and the performance through the organizational commitment as a mediator empirically. The data was taken from 31 lecturers and 59 staffs and inspect by path analysis with SPSS. The study shows through the organizational commitment as a mediator the personality factors, such as Conscientiousness, Neuroticism, and Openness to New Experience are affecting the lecturer's performance. Meanwhile, as for the staffs, it just Conscientiousness and Neuroticism that associated with the performance. In addition, the study also shows that the organizational commitment has no effect on the performance of the lecturers.

Keywords— Personality, Big Five Theory, Performance, Organizational Commitment