University libraries contribute to their universities by collecting, organizing, and disseminating information; supplying space for research activities; and helping beneficiaries find and use information. Libraries are often beneficiary-centered and engage in a variety of academic library performance evaluation activities to determine whether the library is meeting its specific goals and to justify library expenditures. To ascertain the satisfaction of library users with the quality of services provided to them and their conformity with the expected level of services. This study aims to assess the level of service quality (SQ) provided by the Central Library of King Faisal University of Saudi Arabia (KFU) from users' perspectives using the LibQUAL + scale distributed on campus and the library on the sample of the study, which was 133 respondents. The study relied on the use of the evaluation curriculum, and, in part, on the prescribed curriculum. The survey results revealed that library users had the maximum expectations in the library as far away from the library as an LP of three dimensions. The results of the study were arranged for the three dimensions to measure the Library's actual performance respectively as a place (LP), followed by information control (IC) and service impact (AS) based on average scores of 6.91, 6.56, and 6.21, respectively. The results of the sample study also revealed that the quality of users' tangible library services (LSQ) is below the required level than expected