Academic libraries are an integral part of higher educational institutions in Nigeria in order for them to achieve their mission of national development. Knowledge sharing has become a survival kit for academic libraries to improve service provision and remain relevant in today’s information world. This study explores the roles of knowledge sharing among staff at the Delta State University (DELSU) library, Abraka for improved service provision and also suggests strategies to enhance knowledge sharing among staff for improved service provision. The theory of organisational knowledge creation (SECI) and the Social Exchange Theory (SET) underpinned this study. The study adopted a mixed method research approach and case study research design. While questionnaires were the main data collection instruments, interviews were the supplementary instruments. The entire staff at the DELSU library, Abraka was the target population for this study. A census was taken on the entire staff of the library to collect data using the questionnaires while the heads of the different library sections were purposively sampled for the collection of data through interviews. The quantitative data collected using questionnaires was analysed with the Statistical Package for Social Science (SPSS) software and the results were presented in tables and simple descriptive statistics. The interview data was analysed and interpreted using thematic analysis and was presented in predetermined themes according to the research objectives. A total of 60 out of the 63 copies of the questionnaire administered were retrieved and interviews were conducted on all seven participants sampled. The study revealed that knowledge sharing among staff members play an important role in improving service provision in the library in terms of the provision of accurate and in time services, learning best library practices, avoidance of mistake repetition and solving problems encountered on the job. However, knowledge sharing is not formalised in the library. Therefore, effective knowledge sharing for service provision has not been achieved. The greatest barriers to knowledge sharing for improved service provision in the library are the lack of a knowledge sharing culture, information and communication technological tools and infrastructures and motivation as well as the inferiority and superiority complex among staff. The greatest motivation for the library staff to share knowledge is to improve service provision. The study suggests strategies to encourage knowledge sharing among the staff members in order to improve service provision. These strategies include an adequate reward system, as well as a continuous awareness and appraisal of knowledge sharing. / Information Science / M. Inf.