This book constitutes the refereed proceedings of the 13th International Conference on Intelligent Technologies for Interactive Entertainment, INTETAIN 2021. Due to the COVID-19 global pandemic, the conference was held virtually. This year's conference put an emphasis on the future of technologies for interactive entertainment. The 25 full papers presented at the conference and thus included in this book were selected from 50 submissions, and present novel and innovative work in areas including art, science, design and engineering regarding computer-based systems or devices that provide intelligent human interaction, learning, or entertainment experiences. The papers are grouped in 2 sessions of thematic issues on emerging applications and augmented reality.