This CCIS post conference volume constitutes the proceedings of the 4th International Conference on Internet of Things, ICIoT 2023, in Chennai, India, during April 26-28, 2023. The 9 full papers and 2 short papers presented in this volume were carefully reviewed and selected from 112 submissions. They are grouped into the following topics: knowledge exchange, fostering collaboration, and inspiring new ideas that drive the future of IoT.