This study is analyzing the work environment, job satisfaction, and commitment in enhancing the organizational citizenship behavior of the internal auditor in Indonesia telecommunication industry. A conducive working environment will have a positive impact on job satisfaction and organizational commitment. Employees will feel comfortable and confident with the organization safe with their job. If employees satisfied with their work, they want to support the goals, objectives and maintain their membership in the organization. The work environment is antecedent of job satisfaction and commitment variables. Job satisfaction and commitment have a positive impact on organizational citizenship behavior. Employees who are satisfied with the job and organization are tends to perform extra roles for the organization’s benefit. High organizational commitment encourages employees exhibit a strong OCB such as high labor initiative, concerned about a co-worker in the organization interests, and prioritize the organization concerned. Work environment, job satisfaction, and organizational commitment are important in developing the behavior of OCB.