This book constitutes the proceedings of the International Conference on Web of Services, ICWS  2020, held virtually as part of SCF 2020, in Honolulu, HI, USA, in September 2020. The 14 full papers presented in this volume were carefully reviewed and selected from 52 submissions. The conference proceeding  ICWS 2020 presents the latest fundamental advances in the state of the art and practice of Web-based services, identify emerging research topics, and define the future of Web-based services. All topics regarding Web-centric services, enabling technologies and applications align with the theme of ICWS.