Increased competition in the ever tight business competition makes the companies more intense in thinking about business strategies, especially to retain customers and provide satisfaction to customers. Failure to realize customer loyalty will result in customers not using the product or service for a long period. The application of Customer Relationship Management (CRM) is very effective in managing influential business strategies to maximize customer loyalty. But with the rapid development of technology, customers want fast and accurate service. Organizations have begun to use information technology in implementing business strategies Engaged in coworking space rental services coworking space, meeting room who have problems managing loyal customer data. Starting from the incoming customer data every customer comes, mapping loyal customers and promotions provided does not match the segmentation impact on returning customers doing coworking space not following the expected target. In building customer loyalty information systems using this CRM approach, data collection methods using the method of observation and interviews, system development method used is a waterfall, and the output of this system is a system that can manage customer data, map loyal customers, and promotions given according to segmentation. Our acceptance test shows that all functions work well and have an overall high acceptance rate of 85.71%. These results indicate that it is very helpful with customer loyalty information systems. Even though there are some suggestions given during the test, suggest adding a payment feature, recommend adding the conversion feature to the document (.pdf) in the report section.