This book constitutes the refereed proceedings of the 12th International Conference on Social Robotics, ICSR 2020, held in Golden, CO, USA, in November 2020. The conference was held virtually. The 57 full papers presented were carefully reviewed and selected from 101 submissions. The theme of the 2020 conference is Entertaining Robots. The papers focus on the following topics: human-robot trust and human-robot teaming, robot understanding and following of social and moral norms, physical and interaction design of social robots, verbal and nonverbal robot communication, interactive robot learning, robot motion and proxemics, and robots in domains such as education and healthcare.