This volume constitutes the proceedings of Third International Conference on Artificial Intelligence of Things and Systems, AIoTSys 2025, held in Lanzhou, China, during August 15&17, 2025.

The 37 full papers included in this book were carefully reviewed and selected from 88 submissions. These papers discuss the integration of AI into IoT (AIoT) and its impact across a wide range of economic and social domains, driving the transformation of traditional industries into a new era of intelligence that goes beyond mere digitization and connectivity.