This study aims to draw conclusive findings and provide a detailed overview of the investigated phenomenon using data collected at a single point in time. The survey was conducted through the distribution of questionnaires among employees working at a manufacturing company in Jepara Regency. The sampling technique used was stratified random sampling based on employee positions to ensure that all employee groups were represented, with a sample size of 108 respondents. The authors ensured that responses from each employee position had equal representation in the analysis. The coded data were then imported into SmartPLS 3 software for comprehensive analysis. The analysis results show that there is a positive and significant relationship between procedural justice and employee job satisfaction. Additionally, employee job satisfaction has a significant positive impact on organizational citizenship behavior (OCB). Mediation analysis revealed that job satisfaction fully mediates the relationship between procedural justice and OCB, where the direct path between procedural justice and OCB becomes insignificant when job satisfaction is included as a mediator. The managerial implications of these findings are that companies should focus on improving employee job satisfaction through effective implementation of procedural justice to encourage OCB. From an academic contribution perspective, this study enhances the understanding of the mediating role of job satisfaction in the relationship between procedural justice and OCB, and supports previous research highlighting the importance of organizational justice in enhancing job satisfaction.