Scant amount of research led to conduct an empirical investigation with the purpose of identifying the effect of supervisor’s green commitment on employee green work behavior. While addressing this gap in the extant literature, the study made a methodological contribution by validating a scale for green work behavior. A sample of 96 machine operators from often ready to wear apparel-manufacturing firms in Katunayake and Pallekele industrial zones in Sri Lanka responded to a survey. The collected data were analyzed with the hierarchical regression analysis. The results reported that the commitment demonstrated by supervisors in terms of their dedication to the environmental sustainability and willingness to engage with pro-environmental behavior fosters employees to engage with green work behavior. The outcomes of the study provide implications to psychological contract theory and the social sustainability theory. In terms of policy implications, the study proposes decision makers to implement green commitment- and green behavior-enhancing human resource management (HRM) practices. The policy makers should introduce green commitment-enhancing HR practices for their employees such as rewards, recognition programs, inclusion of green criteria in performance management, as well as green training. Consequently, managerial and supervisory level employees will commit on achieving environmental sustainability goals and assist other employees to perform their green work. The limitations of the study and directions for future studies are also discussed.
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