The article reviews the advancements in magnetoelectric (ME) microelectromechanical and nanoelectromechanical systems (M/NEMS) for the Internet of Things (IoT). ME systems, which combine piezoelectric and magnetostrictive materials, offer significant advantages such as reduced size, weight, and power consumption. The review covers key materials, composites, and devices, including logic memory, magnetic sensing, wireless power transfer (WPT), ultra-compact antennas, and power, radiofrequency (RF), and microwave electronics. ME antennas, in particular, are highlighted for their ultra-compact size, ground plane immunity, and enhanced radiation on a ground plane. The article also discusses ME-based WPT, which can achieve efficiencies comparable to or higher than resonant coil-to-coil inductive WPT links. Additionally, ME materials are explored for tunable and nonreciprocal RF components, demonstrating superior power efficiency and compactness. The review concludes with a discussion on the potential of ME M/NEMS in IoT applications, emphasizing their role in creating a streamlined, interconnected, and intelligent ecosystem.The article reviews the advancements in magnetoelectric (ME) microelectromechanical and nanoelectromechanical systems (M/NEMS) for the Internet of Things (IoT). ME systems, which combine piezoelectric and magnetostrictive materials, offer significant advantages such as reduced size, weight, and power consumption. The review covers key materials, composites, and devices, including logic memory, magnetic sensing, wireless power transfer (WPT), ultra-compact antennas, and power, radiofrequency (RF), and microwave electronics. ME antennas, in particular, are highlighted for their ultra-compact size, ground plane immunity, and enhanced radiation on a ground plane. The article also discusses ME-based WPT, which can achieve efficiencies comparable to or higher than resonant coil-to-coil inductive WPT links. Additionally, ME materials are explored for tunable and nonreciprocal RF components, demonstrating superior power efficiency and compactness. The review concludes with a discussion on the potential of ME M/NEMS in IoT applications, emphasizing their role in creating a streamlined, interconnected, and intelligent ecosystem.