The purpose of this study is to investigate the effect of organizational justice on promoting the integrity of the administrative system in the light of organizational commitment in the eleven districts of Shiraz Municipality and its affiliated organizations. The purpose of this study is to investigate the effect of organizational justice on promoting the health of the administrative system in the light of organizational commitment in the eleven districts of Shiraz Municipality and its affiliated organizations. This research is considered as a field branch based on the applied purpose and in terms of data collection type of descriptive-survey research; It is also correlated in terms of the relationship between research variables; The statistical population of this study was all managers, deputies and senior experts (154 persons) in the eleven districts of Shiraz Municipality and its affiliated organizations. The sample was selected by judgment. This research was conducted in 1398 in the framework of a research project. Cronbach's alpha was used to measure the reliability of the measuring instrument; The validity of the questionnaire of organizational justice (0.92), administrative system integrity (0.90) and organizational commitment (0.86) was confirmed. Data analysis was performed at two levels of descriptive and inferential statistics using statistical software: SPSS and smart-PLS. The results showed that the status of organizational commitment of employees, organizational justice and integrity of the administrative system in the eleven districts of Shiraz Municipality and its affiliated organizations is not at an appropriate level and they are far from the ideal level; Organizational commitment also mediates the relationship between organizational justice and the integrity of the administrative system; This means that if justice is achieved in the organization, the commitment of employees will increase and as a result, the integrity of the administrative system will increase.