This book constitutes the refereed proceedings of the 7th EAI International Conference on Smart Grid and Internet of Things, SGIoT 2023, held in TaiChung, Taiwan, in November 18-19, 2023 The 15 regular papers presented were carefully reviewed and selected from 38 submissions. The papers are organized in subject areas as follows: IoT, communication security, data mining and big data; WLAN, wireless internet and 5G; protocol, algorithm, services and applications.