This study was carried out to investigate the Utilization of Knowledge Management Tools for library operations and services in federal university libraries of Northern States of Nigeria. To do this, five research questions were formulated and three hypotheses were tested. Survey research method was employed in the conduct of this study. The total number of library staff used for the study was 967 (nine hundred and sixty seven), drawn from Federal university libraries in the Northern states of Nigeria. Four hundred and twenty four (424) were drawn as sample for this study from six university libraries. The instrument used for data collection was the questionnaire. The data collected for the study were presented and analyzed using both descriptive statistics and inferential statistics. Frequency distribution tables and percentages were used for the descriptive statistics while ANOVA and Chi square test were used to test the three hypotheses formulated and determined the areas of differences among the university libraries studied. The findings showed that Internet and space for conference/workshops/meeting were the Knowledge Management Tools mostly available and utilized for library operations and services delivery while others were not fully utilized. It was recommended that, Multipurpose Knowledge Management Tool (IT and Non-IT). Should be designed in each unit/division and the library in general considering the operations and services so as the goals of the establishments would be achieved and to encourage collaboration in knowledge creation and sharing for library operations and services etc. Thus, it was concluded that, federal university libraries need to recognize the knowledge of its staff and create an environment (IT and Non-IT) in which the knowledge can be created, valued and share