This study aims to find out users' perceptions towards quality of Window of the World (WOW) service based on the LibQUAL+TM models in the library of Universitas Gadjah Mada Yogyakarta. The type of the study is descriptive quantitative. Subjects of the study were users of the facilities of WOW service, while the object of the study was users' perception about the quality of WOW service. Data wer…