The three-volume set LNCS 15806–15808 constitutes the thoroughly refereed proceedings of the 12th International Conference on Learning and Collaboration Technologies, LCT 2025, held as part of the 27th International Conference, HCI International 2025, which took place in Gothenburg, Sweden, June 22-17, 2025. The total of 1430 papers and 355 posters included in the HCII 2025 proceedings was carefully reviewed and selected from 7972 submissions. The papers have been organized in topical sections as follows:Part I: Designing Learning Experiences; Technological Innovation in EducationPart II: From Human Teachers to AI Educators; Intelligent Learning Environments Part III: Serious Games and Gamification; Immersive Learning; Understanding Learning Experiences