Management of quality and system quality assurance represents the starting point for higher education evaluation, and indirectly it is also applicable to academic libraries as a part of that system. Quality evaluation and management efficacy of an academic library represents the most important indicator of the importance and sustainability of the library in its working environment. Therefore, for the last few years the attention of academic librarians has been directed to implementation and development of scientific research methods and techniques measuring quality levels of library service and library activities as a whole. Evaluation includes examination of the results of quantitative and qualitative indicators of library efficacy, with the purpose of devoting continuous efforts to quality improvement. The content of this paper is presented in two sections. In the first one the focal point will be the quality system examined within the theoretical and methodological frame, legislation, regulations, standards, guidelines and quality evaluation models. The second section contains the research examining the service quality level of the Library of the Faculty of Humanities and Social Sciences at University of Rijeka from the user perspective, that is, user satisfaction with the services the Library provides. Research hypothesis of this paper is that the Library of the Faculty of Humanities and Social Sciences at University of Rijeka is an important part of the Faculty, providing essential general science, information and other library resources necessary for implementation of the educational, as well as scientific and research process. The research was conducted by survey method on the sample of 248 respondents, and the statistical analysis provided a great amount of relevant information on the basis of which further management of the Library of the Faculty of Humanities and Social Sciences at University of Rijeka will be improved. Guided by acquired cognizance of the importance of quality evaluation, the aim of this paper is to provide a humble contribution to the popularisation of research of quality in Croatian academic libraries.