Abstract: Organizational commitment is an attitude towards employees’ loyalty to the organization and is a continuous process that organization members show their interest towards organization, its success and efficiency through it. Today’s justice and its implementation are essential and innate needs of human beings that have provided a suitable circumstance to develop human societies. The purpose of current study is to investigate the relationship between organizational justice and organizational commitment of employees in Saderat Bank. Method is descriptive-explorative one and is applicable in terms of objective. Statistical population includes all employees of Saderat Bank in Tehran that are 1200 people. A sample of 291 employees was estimated by cochran formula. In this study, Nihoff and Moorman’s organizational justice questionnaire and Alen and Meyer’s organizational commitment questionnaire were used. The validity and reliability of instrument were confirmed by experts’ viewpoints and Cronbach’s coefficients, respectively. The coefficient for justice was 0.89 and for commitment was 0.87. Hypotheses analysis was based on Spearman’s test and regression variance analysis. Results indicated that there is a significant relationship between organizational justice (with dimensions of distributional justice, procedural justice and interactional justice).