This study presents the results of an exploratory study on users' perceptions of service quality in university libraries, using data collected fromr 691 respondents of ten universities. The main objectives is to identify the dimensions used by users when evaluationg the quality of services in university libraries, and to explore the differences in the perception of service quality among different constituencies. The top five indicators ranked by user are: collection supporting research needs, rang of materials, up-to- date equipment, up-to-date collection, and comfortable space-layout. The faculty ranked "collection supporting research needs" as top one, while "up-to-date equipment" are placed by students. The results show that there are singnificant differences in terms of the rankings of indicators as perceived by faculty and students. Furthermore, significiant differences also exist in terms of service quality factors between faculty and students.