SUMMARY
This study examines the impact of university library performance, service quality, and leadership support on user satisfaction at the Muhammadiyah University of North Sumatra. This study employs a sample of 380 students from nine faculties with data analysis techniques using SmartPLS. The study results prove that library performance, service quality, and leadership support significantly influence library user satisfaction. Service quality is an essential predictor of library user satisfaction. The leadership support becomes a quasi-moderation that strengthens library performance, service quality, and library user satisfaction. Consequently, users are satisfied with the services provided by the UMSU library and will help decision-makers to provide more support for library management in the future. The authenticity of this study provides knowledge about UMSU library's strategies in comprehensively using library performance indicators and service quality to increase user satisfaction and support the implementation of MBKM.