This book constitutes the refereed post-conference proceedings of the Third International Conference on Internet of Everything, IoECon 2024, which took place in Guimarães, Portugal, in September 26-27, 2024. The 10 full papers were carefully reviewed and selected from 28 submissions.The papers cover the following topics: Machine-to-Machine (M2M); People-to-Machine (P2M) or Machine-to-People (M2P).