The 2021 IEEE World Congress on Services will be held as an all-online virtual event. SERVICES 2021 is solely sponsored by the IEEE Computer Society under the auspice of the Technical Committee on Services Computing (TCSVC). The scope of SERVICES 2021 covers all aspects of services computing and applications, current or emerging. Centered around services computing, SERVICES 2021 covers various systems and networking research pertaining to cloud, edge and Internet-of-Things (IoT), as well as technologies for intelligent computing, learning, Big Data and blockchain applications, addressing critical issues such as knowledge network, high performance, security, privacy, dependability, trustworthiness, and cost-effectiveness. Particularly, the 2021 Congress will welcome papers on the impact of COVID-19 on services and corresponding infrastructure.