This book constitutes the refereed proceedings of the 11th EAI International Conference on IoT as a Service, IoTaaS 2025, held in Yibin, China, during December 6-7, 2025.

The 12 full papers included in this book were carefully reviewed and selected from 32 submissions. They are organized into the following topical sections:Network and Communication Technology in the Internet of Things; Big Data; Information acquisition and processing technology based on artificial intelligence (AI); IoT context based analytics.