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Information and Communication Technology (ICT) has revolutionalised every aspect of library operations and services. This paper discusses the changing roles of libraries in Nigeria brought about by advances in ICT. Through review of literature from various databases such as SCOPUS, Google Scholar and Ebscohost, the study provides a conceptual background of ICT application in Nigerian libraries; examined its importance and opportunities for librarians; as well as the associated challenges. The paper therefore provides useful insight on the importance of ICT in knowledge society and Nigeria in particular, through libraries. The last part of the paper further explores the implications of the reviewed literature through a PEST analysis. This paper will therefore be useful to policymakers on library issues as it contributes to the debate on the need for ICT tools in library operations and social informatics development in Nigeria.