This study aimed to investigate the mediating effect of work ethics on the relationship between organizational behaviour foundations and classroom management among 300 teachers in Division of Davao del Sur. This study employed non-experimental design utilizing path analysis correlation technique. The statistical tools used were mean, Pearson r, and path analysis using SPSS. Research instruments on organizational behaviour foundations, classroom management, and work ethics which were validated were used as sources of data. Using Pearson r, the results revealed that there is significant relationship between organizational behaviour foundations and classroom management, organizational behaviour foundations and work ethics, and work ethics and classroom management. Utilizing path analysis, the results of the study revealed that there is a partial mediation of work ethics on the relationship between organizational behaviour foundations and classroom management. Consequently, the findings of this study contended that work ethics as mediating variable carries a half influence on organizational behaviour foundations and classroom management. Thus, it can be inferred that organizational behaviour foundations caused classroom management because of the presence work ethics and other factors not included in the model. Moreover, the research findings suggested that organizational behaviour foundations of teachers cannot function if the work ethics is not elevated and used as a factor to influence classroom management.