This book constitutes the referred proceedings of the 8th International Conference on Attacks and Defenses for Internet-of-Things, ADIoT 2025, held in Changzhou, China, during November 14–16, 2025.The 14 papers included in these proceedings were carefully reviewed and selected from 42 submissions. These papers focus on both sides of IoT attacks and defenses, and discuss either practical or theoretical solutions to identify IoT vulnerabilities and IoT security mechanisms.