In pursuing a sustainable future, libraries have emerged as crucial advocates for environmental, financial and social awareness. This paper explores the theoretical review of integrating of smart library elements (smart technology, smart services and smart people) in libraries to promote sustainability. By exploring the seamless convergence of these elements, the paper unveils a new paradigm in which libraries are moving beyond their traditional roles to become dynamic, environmentally conscious places. Smart technologies provide energy efficiency, resource optimisation and digitisation, while smart services optimise the user experience and promote sustainability awareness. Smart people that include librarians and staff empowered users serve as crucial agents of change. Despite the challenges posed by technological barriers and costs, the vision for libraries is clear: to lead through continuous adaptation, innovation and collaboration. The ultimate goal is to create sustainable smart libraries that herald a greener and more responsible future.