The book "IoT Based Smart Energy Meter Using Theft Detection" introduces an intelligent and secure solution for modern energy monitoring systems. It focuses on the development and implementation of a smart energy meter integrated with Internet of Things (IoT) technology to monitor real-time power consumption and detect electricity theft. This smart system aims to reduce human error, prevent unauthorized electricity usage, and promote efficient energy management. It enables utility providers and users to access live consumption data remotely and receive instant alerts in case of any tampering or abnormal activity. The book discusses the design methodology, components used, communication protocols, and theft detection techniques in detail. With a practical and application-based approach, this book serves as a valuable guide for engineering students, educators, and industry professionals interested in smart energy solutions and IoT innovations in power systems.