Purpose: A descriptive study was conducted at Aluminum Corporation in Iran in order to construct a causal model of organizational citizenship behavior based on personality factors with mediation of job involvement, job self-efficacy, factual well-being and organizational commitment. Material and method: The research sample consisted of 360 employees of the mentioned company selected by stratified random sampling method. Organizational citizenship behavior, personality, job involvement, job self-efficacy, occupational well-being, and organizational commitment questionnaire was used to collect data. Findings: The research analysis was performed using correlation, structural equations. Finally, the findings of the research showed that between personality factors and organizational citizenship behavior is significant relation. Job self-efficacy factors and organizational commitment have a direct and indirect effect on organizational citizenship behavior. Discussion: However, the factor of well-being of the subject only had a direct effect on organizational citizenship behavior. Also, the factor of job involvement only indirectly influences organizational citizenship behavior.