AbstractLean manufacturing practices (LMP) focus on the systematic elimination of waste and non-value added activity from the production process for improved EP. Meanwhile, ISO 14001 is an international standard that assist managers to reduce environmental impact and to expand business. The aim of this study is to examine the relationship between LMP, ISO 14001, and EP for Malaysian automotive suppliers. In this study, 275 sets of questionnaire were successfully collected that brought to 68.8% response rate. Structural equation modeling (SEM) technique was utilized to perform the statistical analysis of the data survey. Reliability analysis, exploratory factor analysis, and confirmatory factor analysis were carried out. The results showed that the impact of LMP implementation on EP increases with a mediating of ISO 14001 in Malaysian automotive suppliers. Thus, this research which has undergone detailed methodology and analysis and contributing to the limited existing literature in the relatio.....