This study aims to ascertain how academic library users perceive the conversion of their library into a sustainable one and how aware they are of library sustainability. A structured questionnaire was utilized to collect data from users of a central public university library in Bangladesh using a quantitative approach. Results revealed that though the majority of users were aware of the sustainable library concept, they did not believe their library was sustainable. However, they expressed a desire to learn more and actively participate in eco-friendly activities at the library. The majority of users believed that the library would have an eco-friendly and healthy indoor and outdoor environment if such a renovation were to occur. Technological obstacles were the major barriers to such transformation identified by the users. Finally, the study provides recommendations for addressing the issues raised and promoting a long-term, user-friendly atmosphere for academic libraries in Bangladesh.