© 2023 Mohamad et al.This study examines the mediating role of learning motivation in the relationship between supervisors' roles in the administration of training programmes and in-role behaviour. A cross-sectional study was used to collect 370 survey questionnaires from employees at different divisions/departments in the Malaysian public sector. The SmartPLS is utilised to evaluate the quality of the study instrument and subsequently test the study's hypotheses. The structural equation modelling test indicated that in-role behaviour is affected by supervisors' roles in the administration of training programmes. Hence, the effect of supervisors' roles in the administration of training programmes on in-role behaviour is mediated by learning motivation. This finding has contributed to the supervisors, managers and operation employees, as well as to the study related to learning motivation in dynamic organisations.