Abstract: The exploration of perovskite oxides, particularly double-perovskite oxide SrFeMoO_6−δ (SFM), has been a focal point in solid state chemistry and materials science. Because of their unique electronic, magnetic, and catalytic properties, SFM materials have emerged as promising candidates for various energy conversion and storage applications. This review provides a comprehensive overview of the progress achieved in utilizing SFM-based materials across different research fields, such as Solid Oxide Cells (SOCs), Protonic Ceramic Cells (PCCs), and electrocatalysis. Further, we have highlighted the importance of optimization strategies aimed at enhancing the functionalities of SFM-based materials. These strategies, coupled with a deeper understanding of the underlying reaction mechanisms, have paved the way for significant advancements in tailoring the SFM properties to meet the requirements of specific applications. By improving the efficiency of energy conversion devices and enhancing the catalytic activity of various chemical processes, SFM has demonstrated remarkable potential for contributing to sustainable energy technologies.