This report, titled "Service-Based Architecture in 5G" by the NGMN Alliance, is a final deliverable that was approved on January 19th, 2018. The report focuses on the use of service-based architecture in 5G networks and is intended for public distribution. The report was contributed to by various organizations, including AT&T, Bell Canada, China Mobile, Deutsche Telekom AG, NTT DOCOMO, Sprint, SK Telecom, U.S. Cellular, and Vodafone. The report is provided "as is" and is subject to change without notice. The report is not intended to be used for product design purposes.