In an era of increasing environmental awareness and social accountability, ESG (Environment, Social, and Governance) practices have become a strategic priority for logistics enterprises in Southeast Asia. This study aims to model the multivariate impacts of ESG implementation on firm sustainability, with a particular focus on the mediating role of Time-Critical Logistics (TCL). ESG integration is expected to enhance environmental performance, social responsibility, and governance transparency, while TCL supports the efficiency of time-critical logistics operations. Using a quantitative approach and Structural Equation Modeling (SEM), the study analyzes data from 369 from major logistics enterprises in Southeast Asia. Findings are anticipated to confirm the positive influence of ESG on sustainability, with TCL playing a key mediating role.