This book constitutes the refereed proceedings of the 10th International Conference on Games and Learning Alliance, GALA 2021, held in La Spezia, Italy, in December 2021. The 21 full papers and 10 short papers were carefully reviewed and selected from 50 submissions. The papers cover a broad spectrum of topics: Serious Games Applications; Serious Game to Improve Literacy; Technology used for Serious Games; Serious Game Usage; Serious Games Design. Chapters “Cards and Roles: Co-designing Privacy Serious Games with an Online Role-Playing Boardgame" and “An Authoring Tool to Engage Younger Audiences in the Development of Nature Preservation Games: The G4N Toolkit to Game Design �  are available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.