The study shows the gap between perceived and expected service quality of Adikavi Nannaya University. Data collected from undergraduate and post graduate students of College of Arts and Sciences, College of Science and Technology, College of Engineering, and College of Education. A sample of 150 students, research scholar and faculty was selected and out of that 120 was responded (80%) for data analysis. The collected data were analyzed by comparing mean and standard deviation of perceived and expected service quality. Gap analysis of expected and perceived service quality was also calculated. Findings disclose a difference between the expectations and perceptions of respondents and thus, require that the library should enhance its services; especially staff should be lean more things on user need and their expectation on library services. The results are helpful and act as strategy for the library administration in identifying their strong points and weak points.