The significance of firm environmental performance (FEP) has been recognized by academic experts. Nevertheless, a comprehensive exploration of the driving factors behind it remains lacking. In order to bridge this gap, this study employs the perspective of the Triple Bottom Line theory and explores the influence of senior management sustainability commitment (SMSC) and green human resource management practices (GHRMP) on FEP. Furthermore, the study explores the direct and mediating role of GHRMP on the SMSC–FEP relationship. The moderation role of environmental knowledge and green organizational culture was also explored. A questionnaire with closed‐ended questions was sent online to 321 manufacturing companies, followed by analysis using SmartPLS 4.0. The results of this study indicate that SMSC has a significant influence on both GHRMP and FEP. Elucidation is provided in the discourse relating to the theoretical and practical contribution. Additionally, the limitations and potential for further inquiry are specified.