This study aims to analyze the mediating role of affective commitment on the effect of perceptions of organizational support and procedural justice on job performance. Respondents in this study are Civil Servants at the BPS Statistics of the Province and the Special Region of Yogyakarta. The sample used was 188 selected using purposive sampling technique. Data was analyzed using the Structural Equation Modeling (SEM) method with Analysis Moment of Structural (AMOS) 24.0 software. This study found that perceived organizational support and procedural justice has no significant direct effect on the job performance of Civil Servants at the BPS Statistics of the Province and the Special Region of Yogyakarta. This research also shows that perceived organizational support and procedural justice have a significant effect on affective commitment and there is a significant effect between affective commitment on job performance. The finding of this research show that affective commitment able to mediate perceived organizational support and procedural justice on job performance