This study aimed to examine and analyze the effect of Perceived Person Organization Fit and Perceived Person Job Fit on Organizational Citizenship Behavior with Organizational Commitment as an intervening variable. This research was conducted using a descriptive method in the Social Welfare Institution at Central Aceh - Takengon with sample of 42 respondents. The approach used in this research was Structural Equation Model (SEM) with Partial Least Square (PLS) analysis tool 3.0. The results showed that the Perceived Person Organization Fit (P-O Fit) and Perceived Person-Job Fit (P-J Fit) had a significant positive effect on Organizational Commitment. Perceived Person Organization Fit (P-O Fit) and Perceived Person-Job Fit (P-J Fit) had a significant positive effect on Organizational Citizenship Behavior (OCB). Organizational Commitment had a significant positive effect on Organizational Citizenship Behavior (OCB).