This research based on the importance,of Organizational Citizenship Behavior (OCB) for employees in an organization, because the organization will obtained many benefits if they have an employees with the high level of OCB. Therefore, the organization needs to know the things which can cause and or increase the OCB of employees. This.research aims to understand and analysis; 1) the components of the factors that influence the OCB; 2) the dominant factor that influence the OCB; 3) whether there are a differences in factors that influence the OCB between permanent employees and contract employees of Pizza Hut in Malang City. The result of factor.analysis shows that there are twenty two components which construct eight factors with seventy total items can influence the OCB. The dominant factor that influence the OCB is a trust in leadership factor. The result of Independent Samples T Test shows that there are no significant differences in factors that influence the OCB when viewed.from the factors of job satisfaction, organizational commitment, employee's personality, motivation, leadership style, trust in leadership, and organizational culture factors. However, there is a significant.difference in factor that influence the OCB when viewed from the factor of employee's morality.