Purpose: Nowadays, environmental sustainability is a challenge for the enterprises of the whole world. This paper aims to assess the impact of green supply chain management on the environmental performance of Bangladeshi manufacturing firms. Design/methodology/approach: This study is designed to assess the impact of Internal Environmental Management (IEM), Green Purchasing (GrP), Customer Cooperation with Environmental Consideration (CO), Eco-Design (EcD), Investment Recovery (InR), on Environmental Performance of Bangladeshi manufacturing firms and also the relationship between the dependent and independent variables. Statistical analysis has taken place by SPSS, and the elements are the collected data by survey questionnaires from 48 Bangladeshi manufacturing firms of several industrial sectors. Correlation, regression analysis, reliability test, etc. are taken place in data analysis. Findings: In Bangladeshi manufacturing firms at present green purchasing has a standard impact on environmental performance. But the others have a minimum impact on environmental performance where there harms customer co-operation on environmental performance. Research limitations/implications: The study is limited with a little amount of participants. In some cases, there has no proper existence of the full supply chain department. Future studies can be enriched with identifying mediating and moderating relationships, and some other variables like the Cost-effectiveness of GrSCM can be included. This paper can keep an important role in green supply chain management of Bangladeshi manufacturers and the research about this. Practical implication: Collaborative efforts between the Bangladesh government and Bangladeshi manufacturers can establish a gorgeous image in green supply chain management, and the environmental performance can be ensured and enriched. The base of the supply chain also needed to be established fully in Bangladesh. Originality/value: This is the study where the overall situation of green supply chain management of Bangladeshi manufacturers and its impacts on environmental performance has been assessed, and also a maximum industrial sector has been covered as much as possible.