Reports on a study which sought to investigate the major challenges of globalization of library services in Nigeria. The respondents were librarians from 10 Nigerian university and 6 research libraries. The findings show that: inadequate funding/financial support of libraries, provision of relevant IT infrastructures, human resource/capacity building programme in ICT, uninterrupted power supply/backup, and user education in IT pose major challenges to the globalization of library services in the country. Recommends that governments should give priority to funding/financial support of libraries in their budgets and library managements should prioritize investment in ICT within their limited funds to enable them to support the globalization of library services.