Public service is a duty of the government that must be fulfilled, the service performed is an activity to improve the standard of living of the people to achieve prosperity to achieve one of the objectives of the state which is to create prosperity for its citizens. This study aims to determine the quality of Public Services in the Investment Office and One-Stop Integrated Services of South Kalimantan Province. The method used in this study is a descriptive method with a qualitative approach where researchers use the theory of service quality indicators from zeithaml. Data collection techniques used by researchers through observation, interviews, and documentation, and for data analysis using the theory of Miles and Huberman which starts from observation, interviews, data presentation activities and concludes data. The results obtained in this study are that based on service quality indicators from zeithaml, it can be outlined that Service Quality in the Investment Service and Integrated Services of One Door South Kalimantan Province is still not optimal, including the lack of facilities and infrastructure and the location of offices far from the city. As for services from officers, get a fairly positive response, because service officers are very proactive in providing services to the community as the applicant for permission.