The nucleus of any correctional organization is its correctional staff. There are expected in-role behaviors and duties of the staff, but extra-role behaviors referred to as organizational citizenship behavior also are important for correctional organizations. However, there has been little research on correctional staff organizational citizenship behavior. Based on social exchange theory, organizational justice should be important in shaping the organizational citizenship behavior of correctional staff. Distributive and procedural justice are two salient dimensions of organizational justice. Survey data from staff at a private prison indicated that procedural justice had a significant positive relationship with organizational citizenship behavior, but distributive justice had a nonsignificant association. Abstract published by arrangement with Sage.