This chapter presents a detailed exploration of perovskite-based energy devices, emphasizing their critical role in advancing energy harvesting and storage systems for next-generation wearable technologies. Key developments in perovskite thermoelectrics, photovoltaics, and piezoelectrics are discussed, with a focus on their outstanding material properties, fabrication techniques, and energy conversion efficiencies. Furthermore, the chapter investigates the incorporation of perovskites into batteries and supercapacitors, showcasing their potential in enabling flexible, lightweight, and high-performance energy storage solutions. By linking the distinctive attributes of perovskite materials to emerging applications, this chapter highlights their transformative impact on the development of sustainable and self-powered wearable devices.