This book constitutes the proceedings of the 11th International Conference on Internet of Things, Big Data and Security, IoTBDS 2026, held in Benidorm, Spain, during May 21–23, 2026.

The 16 full papers and 33 short papers included in this book were carefully reviewed and selected from 74 submissions. They organized in the following topical sections as follows:

Part I : Big Data Research; Emerging Services and Analytics; Internet of Things (IoT) Applications; Internet of Things (IoT) Fundamentals; and IoT Technologies.

Part II : Security, Privacy and Trust; Special Session on Artificial Intelligence for Emerging IoT Systems: Towards Trustworthy, Scalable, and Domain-Aware Intelligence; Special Session on Edge-Intelligent and Privacy-Aware IoT Systems for Industry.