This book constitutes the refereed proceedings of the 8th International Conference on Interactive Digital Storytelling, ICIDS 2015, held in Copenhagen, Denmark, in November/December 2015. The 18 revised full papers and 13 short papers presented together with 9 posters, 9 workshop descriptions, and 3 demonstration papers were carefully reviewed and selected from 80 submissions. The papers are organized in topical sections on theoretical and design foundations, technical advances, analyses and evaluation systems, and current and future usage scenarios and applications.