This book constitutes the refereed post-conference proceedings of the Second International Conference on Internet of Everything, Io ECon 2023, which took place in Guimaraes, Portugal, in September 2023. Io ECon 2023 presents Io T paradigms to their whole dimension, intelligently connecting devices, people, processes, data, and things. Io E is multi-disciplinary and offers an opportunity to explore the co-relations between different areas, techniques, and theories about a new cyber world. The 11 revised full papers were carefully reviewed and selected from 38 submissions. The papers focus on a complete ecosystem that digitally interconnects everything, including people-to-people, people to-machines, and machines-to-machines.