This study aims to determine the influence of service quality dimensions of patient loyalty in private hospitals in the town of Singaraja-Bali. The technique of data collection was conducted by giving questionnaire to patients in those hospitals. The results of this study indicate that: first, service quality which consists of tangible, reliability, responsiveness, assurance, and empathy have a significant influence on patient loyalty not only partially but also simultaneously; second, reliability is a dimension that has a dominant influence on the patient loyalty.